Vulnerability-Lookup

ALSA-2026:21557

Vulnerability from osv_almalinux – Published: 2026-05-28 00:00 – Updated: 2026-06-08 10:00 – Source website

Summary

Important: kernel security update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645)
kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
kernel: mm: thp: deny THP for files on anonymous inodes (CVE-2026-23375)
kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)
kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)
kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)
kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)
kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)
kernel: io_uring/rsrc: reject zero-length fixed buffer import (CVE-2026-43006)
kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)
kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)
kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023)
kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116)
kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)
kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)
kernel: Linux kernel dpaa2-switch: Kernel memory corruption via out-of-bounds write (CVE-2026-43205)
kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)
kernel: mm/page_alloc: clear page->private in free_pages_prepare() (CVE-2026-43303)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:21557	ADVISORY
	https://access.redhat.com/security/cve/CVE-2024-56645	REPORT
	https://access.redhat.com/security/cve/CVE-2025-68183	REPORT
	https://access.redhat.com/security/cve/CVE-2026-23375	REPORT
	https://access.redhat.com/security/cve/CVE-2026-23392	REPORT
	https://access.redhat.com/security/cve/CVE-2026-23455	REPORT
	https://access.redhat.com/security/cve/CVE-2026-31684	REPORT
	https://access.redhat.com/security/cve/CVE-2026-31685	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43006	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43020	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43023	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43027	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43051	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43110	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43116	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43158	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43190	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43205	REPORT
	https://access.redhat.com/security/cve/CVE-2026-43303	REPORT
	https://bugzilla.redhat.com/2334560	REPORT
	https://bugzilla.redhat.com/2422699	REPORT
	https://bugzilla.redhat.com/2451199	REPORT
	https://bugzilla.redhat.com/2451218	REPORT
	https://bugzilla.redhat.com/2454810	REPORT
	https://bugzilla.redhat.com/2461757	REPORT
	https://bugzilla.redhat.com/2461759	REPORT
	https://bugzilla.redhat.com/2464369	REPORT
	https://bugzilla.redhat.com/2464402	REPORT
	https://bugzilla.redhat.com/2464455	REPORT
	https://bugzilla.redhat.com/2464462	REPORT
	https://bugzilla.redhat.com/2464496	REPORT
	https://bugzilla.redhat.com/2467005	REPORT
	https://bugzilla.redhat.com/2467014	REPORT
	https://bugzilla.redhat.com/2467064	REPORT
	https://bugzilla.redhat.com/2467090	REPORT
	https://bugzilla.redhat.com/2467210	REPORT
	https://bugzilla.redhat.com/2468091	REPORT
	https://errata.almalinux.org/10/ALSA-2026-21557.html	ADVISORY

JSON

To clipboard

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  ],
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.  \n\nSecurity Fix(es):  \n\n  * kernel: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645)\n  * kernel: ima: don\u0027t clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)\n  * kernel: mm: thp: deny THP for files on anonymous inodes (CVE-2026-23375)\n  * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)\n  * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)\n  * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)\n  * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)\n  * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)\n  * kernel: io_uring/rsrc: reject zero-length fixed buffer import (CVE-2026-43006)\n  * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)\n  * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)\n  * kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023)\n  * kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116)\n  * kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)\n  * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)\n  * kernel: Linux kernel dpaa2-switch: Kernel memory corruption via out-of-bounds write (CVE-2026-43205)\n  * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)\n  * kernel: mm/page_alloc: clear page-\u003eprivate in free_pages_prepare() (CVE-2026-43303)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:21557",
  "modified": "2026-06-08T10:00:15Z",
  "published": "2026-05-28T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:21557"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2024-56645"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2025-68183"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-23375"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-23392"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-23455"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-31684"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-31685"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43006"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43020"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43023"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43027"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43051"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43110"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43116"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43158"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43190"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43205"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43303"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2334560"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2422699"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2451199"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2451218"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2454810"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2461757"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2461759"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464369"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464402"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464455"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464462"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2464496"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467005"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467014"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467064"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467090"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2467210"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2468091"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/10/ALSA-2026-21557.html"
    }
  ],
  "related": [
    "CVE-2024-56645",
    "CVE-2025-68183",
    "CVE-2026-23375",
    "CVE-2026-23392",
    "CVE-2026-23455",
    "CVE-2026-31684",
    "CVE-2026-31685",
    "CVE-2026-43027",
    "CVE-2026-43006",
    "CVE-2026-43020",
    "CVE-2026-43051",
    "CVE-2026-43023",
    "CVE-2026-43116",
    "CVE-2026-43110",
    "CVE-2026-43190",
    "CVE-2026-43205",
    "CVE-2026-43158",
    "CVE-2026-43303"
  ],
  "summary": "Important: kernel security update"
}

CVE-2024-56645 (GCVE-0-2024-56645)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:02 – Updated: 2026-08-05 11:45

Title

can: j1939: j1939_session_new(): fix skb reference counting

Summary

In the Linux kernel, the following vulnerability has been resolved: can: j1939: j1939_session_new(): fix skb reference counting Since j1939_session_skb_queue() does an extra skb_get() for each new skb, do the same for the initial one in j1939_session_new() to avoid refcount underflow. [mkl: clean up commit message]

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/224e606a8d8e8c7db…
https://git.kernel.org/stable/c/b3282c2bebeeb82ce…
https://git.kernel.org/stable/c/4199dd78a59896e09…
https://git.kernel.org/stable/c/f117cba69cbbd496b…
https://git.kernel.org/stable/c/426d94815e12b6bdb…
https://git.kernel.org/stable/c/68fceb143b635cdc5…
https://git.kernel.org/stable/c/a8c695005bfe6569a…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 224e606a8d8e8c7db94036272c47a37455667313 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < b3282c2bebeeb82ceec492ee4972f51ee7a4a132 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 4199dd78a59896e091d3a7a05a77451aa7fd724d (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < f117cba69cbbd496babb3defcdf440df4fd6fe14 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 426d94815e12b6bdb9a75af294fbbafb9301601d (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 68fceb143b635cdc59fed3896d5910aff38f345e (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < a8c695005bfe6569acd73d777ca298ddddd66105 (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 5.4.287 , ≤ 5.4.* (semver) Unaffected: 5.10.231 , ≤ 5.10.* (semver) Unaffected: 5.15.174 , ≤ 5.15.* (semver) Unaffected: 6.1.120 , ≤ 6.1.* (semver) Unaffected: 6.6.66 , ≤ 6.6.* (semver) Unaffected: 6.12.5 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: j1939_session_new(): fix skb reference counting\n\nSince j1939_session_skb_queue() does an extra skb_get() for each new\nskb, do the same for the initial one in j1939_session_new() to avoid\nrefcount underflow.\n\n[mkl: clean up commit message]"
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              "value": "AV:N - The vulnerable path is in the net/ stack and is entered purely from data received from a remote J1939 peer \u2014 a TP.CM_RTS frame reaches j1939_xtp_rx_rts_session_new() \u2192 j1939_session_fresh_new() \u2192 j1939_session_new(), and peer-supplied TP.CM_CTS frames drive the drop_old free. J1939 segments are routinely bridged to IP by telematics/gateway units, and the kernel CNA scored the equivalent j1939 RTS reception path in the same file (CVE-2026-22997) as AV:N.\nAC:L - The reference-count underflow itself is deterministic \u2014 every session created via j1939_session_new() has an under-referenced head skb, and tearing the session down (timeout, abort, or completion) triggers it. Where the premature free is used, the attacker controls both sides of the race by choosing when and how many RTS/CTS frames to inject and can repeat it indefinitely.\nPR:N - A peer transmitting J1939 frames needs no credentials, account, or privileges on the target \u2014 the stack parses TP.CM_RTS and creates the session automatically. Locally the same defect is reachable from an unprivileged AF_CAN/CAN_J1939 sendmsg(), including over vcan created inside a user namespace.\nUI:N - The j1939 receive handler processes incoming frames and allocates the session in softirq context with no action by any local user. The only precondition is a bound j1939 socket, which is the normal steady state of any device using this stack.\nS:U - The corrupted objects (sk_buff and its heap slab) and the resulting impact are entirely within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the premature free, j1939_session_tx_dat() memcpy()s from the freed skb buffer into outgoing CAN frames, transmitting reclaimed kernel heap contents to the attacker on the bus \u2014 a direct read primitive. More generally, an skb use-after-free lets the attacker groom the freed slab and read back kernel memory.\nI:H - The refcount underflow yields a use-after-free and double-free of an sk_buff, allowing the attacker to reclaim the freed object with controlled data and corrupt adjacent kernel state \u2014 the standard heap-spray primitive for control-flow hijack.\nA:H - The underflow triggers refcount_t saturation warnings (fatal under panic_on_warn) and leaks the skb, while the use-after-free/double-free of the queued skb readily oopses the kernel; either can be induced repeatedly by an unauthenticated peer."
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    "dateReserved": "2024-12-27T15:00:39.840Z",
    "dateUpdated": "2026-08-05T11:45:46.741Z",
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CVE-2025-68183 (GCVE-0-2025-68183)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:43 – Updated: 2026-08-05 12:10

Title

ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr

Summary

In the Linux kernel, the following vulnerability has been resolved: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr Currently when both IMA and EVM are in fix mode, the IMA signature will be reset to IMA hash if a program first stores IMA signature in security.ima and then writes/removes some other security xattr for the file. For example, on Fedora, after booting the kernel with "ima_appraise=fix evm=fix ima_policy=appraise_tcb" and installing rpm-plugin-ima, installing/reinstalling a package will not make good reference IMA signature generated. Instead IMA hash is generated, # getfattr -m - -d -e hex /usr/bin/bash # file: usr/bin/bash security.ima=0x0404... This happens because when setting security.selinux, the IMA_DIGSIG flag that had been set early was cleared. As a result, IMA hash is generated when the file is closed. Similarly, IMA signature can be cleared on file close after removing security xattr like security.evm or setting/removing ACL. Prevent replacing the IMA file signature with a file hash, by preventing the IMA_DIGSIG flag from being reset. Here's a minimal C reproducer which sets security.selinux as the last step which can also replaced by removing security.evm or setting ACL, #include <stdio.h> #include <sys/xattr.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <stdlib.h> int main() { const char* file_path = "/usr/sbin/test_binary"; const char* hex_string = "030204d33204490066306402304"; int length = strlen(hex_string); char* ima_attr_value; int fd; fd = open(file_path, O_WRONLY|O_CREAT|O_EXCL, 0644); if (fd == -1) { perror("Error opening file"); return 1; } ima_attr_value = (char*)malloc(length / 2 ); for (int i = 0, j = 0; i < length; i += 2, j++) { sscanf(hex_string + i, "%2hhx", &ima_attr_value[j]); } if (fsetxattr(fd, "security.ima", ima_attr_value, length/2, 0) == -1) { perror("Error setting extended attribute"); close(fd); return 1; } const char* selinux_value= "system_u:object_r:bin_t:s0"; if (fsetxattr(fd, "security.selinux", selinux_value, strlen(selinux_value), 0) == -1) { perror("Error setting extended attribute"); close(fd); return 1; } close(fd); return 0; }

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/d2993a7e98eb70c73…
https://git.kernel.org/stable/c/edd824eb45e4f7e05…
https://git.kernel.org/stable/c/02aa671c08a4834be…
https://git.kernel.org/stable/c/88b4cbcf6b041ae0f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e3ccfe1ad7d895487977ef64eda3441d16c9851a , < d2993a7e98eb70c737c6f5365a190e79c72b8407 (git) Affected: e3ccfe1ad7d895487977ef64eda3441d16c9851a , < edd824eb45e4f7e05ad3ab090dab6dbdb79cd292 (git) Affected: e3ccfe1ad7d895487977ef64eda3441d16c9851a , < 02aa671c08a4834bef5166743a7b88686fbfa023 (git) Affected: e3ccfe1ad7d895487977ef64eda3441d16c9851a , < 88b4cbcf6b041ae0f2fc8a34554a5b6a83a2b7cd (git)
Linux	Linux	Affected: 5.14 Unaffected: 0 , < 5.14 (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: don\u0027t clear IMA_DIGSIG flag when setting or removing non-IMA xattr\n\nCurrently when both IMA and EVM are in fix mode, the IMA signature will\nbe reset to IMA hash if a program first stores IMA signature in\nsecurity.ima and then writes/removes some other security xattr for the\nfile.\n\nFor example, on Fedora, after booting the kernel with \"ima_appraise=fix\nevm=fix ima_policy=appraise_tcb\" and installing rpm-plugin-ima,\ninstalling/reinstalling a package will not make good reference IMA\nsignature generated. Instead IMA hash is generated,\n\n    # getfattr -m - -d -e hex /usr/bin/bash\n    # file: usr/bin/bash\n    security.ima=0x0404...\n\nThis happens because when setting security.selinux, the IMA_DIGSIG flag\nthat had been set early was cleared. As a result, IMA hash is generated\nwhen the file is closed.\n\nSimilarly, IMA signature can be cleared on file close after removing\nsecurity xattr like security.evm or setting/removing ACL.\n\nPrevent replacing the IMA file signature with a file hash, by preventing\nthe IMA_DIGSIG flag from being reset.\n\nHere\u0027s a minimal C reproducer which sets security.selinux as the last\nstep which can also replaced by removing security.evm or setting ACL,\n\n    #include \u003cstdio.h\u003e\n    #include \u003csys/xattr.h\u003e\n    #include \u003cfcntl.h\u003e\n    #include \u003cunistd.h\u003e\n    #include \u003cstring.h\u003e\n    #include \u003cstdlib.h\u003e\n\n    int main() {\n        const char* file_path = \"/usr/sbin/test_binary\";\n        const char* hex_string = \"030204d33204490066306402304\";\n        int length = strlen(hex_string);\n        char* ima_attr_value;\n        int fd;\n\n        fd = open(file_path, O_WRONLY|O_CREAT|O_EXCL, 0644);\n        if (fd == -1) {\n            perror(\"Error opening file\");\n            return 1;\n        }\n\n        ima_attr_value = (char*)malloc(length / 2 );\n        for (int i = 0, j = 0; i \u003c length; i += 2, j++) {\n            sscanf(hex_string + i, \"%2hhx\", \u0026ima_attr_value[j]);\n        }\n\n        if (fsetxattr(fd, \"security.ima\", ima_attr_value, length/2, 0) == -1) {\n            perror(\"Error setting extended attribute\");\n            close(fd);\n            return 1;\n        }\n\n        const char* selinux_value= \"system_u:object_r:bin_t:s0\";\n        if (fsetxattr(fd, \"security.selinux\", selinux_value, strlen(selinux_value), 0) == -1) {\n            perror(\"Error setting extended attribute\");\n            close(fd);\n            return 1;\n        }\n\n        close(fd);\n\n        return 0;\n    }"
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              "lang": "en",
              "value": "AV:L - Triggering requires local syscalls against a file on the system \u2014 `setxattr`/`fsetxattr` on an EVM-protected xattr, `setfacl`, or `fremovexattr` \u2014 followed by an open/close of the target file. No network, adjacent-network, or physical path reaches the IMA appraisal hooks.\nAC:L - The commit ships a deterministic reproducer: setting any EVM-protected xattr or a POSIX ACL unconditionally clears IMA_DIGSIG every time, with no memory-layout or timing luck involved. The enforce-mode variant needs a race against `process_measurement()`\u0027s `MAY_WRITE` check, but `ima_reset_appraise_flags()` takes no `iint-\u003emutex`, and the attacker drives both sides (one thread spinning on `setxattr(\"system.posix_acl_access\")`, another on `open(O_WRONLY)`); the required IMA-appraise + EVM configuration is a shipped, supported Fedora/RHEL setup, not a rare build option.\nPR:L - `vfs_set_acl()` invokes `security_inode_set_acl()` \u2192 `ima_inode_set_acl()` \u2192 `ima_reset_appraise_flags(inode, 0)` before `set_posix_acl()` ever reaches its `inode_owner_or_capable()` check, so an unprivileged user with no capabilities and no ownership of the file clears the cached IMA_DIGSIG bit on any signed appraised binary \u2014 the syscall fails with -EPERM only after the flag is already gone. No CAP_SYS_ADMIN is needed for this path, unlike the `security.ima` path guarded by `ima_protect_xattr()`.\nUI:N - The attacker performs the xattr/ACL operation and the file open/close entirely from their own process; no victim must mount a filesystem, open a file, or take any other action for the IMA_DIGSIG flag to be cleared and the signature to be replaced.\nS:U - The defeated control (IMA appraisal) and the affected resources (files and their security xattrs) live in the same kernel security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Clearing IMA_DIGSIG both drops the \"signed files cannot be opened for write\" enforcement at `ima_main.c:472` and lets `ima_update_xattr()` re-bless the modified content with a fresh hash plus EVM HMAC, so attacker-substituted content in an appraised executable passes appraisal and subsequently runs \u2014 typically in a privileged/service context \u2014 yielding full disclosure of data reachable by that code. This is the standard treatment of a code-integrity/signature-verification bypass; the bug itself contains no direct memory-read primitive.\nI:H - The file\u0027s IMA digital signature \u2014 the one integrity artifact a local attacker cannot forge, since it is verified against the trusted IMA keyring \u2014 is silently destroyed and replaced by a locally computed hash written through `__vfs_setxattr_noperm()`, which bypasses the `CAP_SYS_ADMIN` gate in `ima_protect_xattr()`. Combined with the lost write-block, this converts \"signed and immutable\" into \"mutable and re-blessed on close\", a complete integrity bypass of IMA appraisal for the affected file.\nA:H - Once a signature is replaced by a plain hash, any policy carrying IMA_DIGSIG_REQUIRED (`appraise_type=imasig`) rejects that file in enforce mode, so appraised binaries become permanently unexecutable \u2014 applied to system-critical files such as init, sshd, or libc consumers this denies service and can leave the system unbootable, and the corrupted xattr persists on disk until the file is re-signed out of band."
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CVE-2026-23375 (GCVE-0-2026-23375)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:05

Title

mm: thp: deny THP for files on anonymous inodes

Summary

In the Linux kernel, the following vulnerability has been resolved: mm: thp: deny THP for files on anonymous inodes file_thp_enabled() incorrectly allows THP for files on anonymous inodes (e.g. guest_memfd and secretmem). These files are created via alloc_file_pseudo(), which does not call get_write_access() and leaves inode->i_writecount at 0. Combined with S_ISREG(inode->i_mode) being true, they appear as read-only regular files when CONFIG_READ_ONLY_THP_FOR_FS is enabled, making them eligible for THP collapse. Anonymous inodes can never pass the inode_is_open_for_write() check since their i_writecount is never incremented through the normal VFS open path. The right thing to do is to exclude them from THP eligibility altogether, since CONFIG_READ_ONLY_THP_FOR_FS was designed for real filesystem files (e.g. shared libraries), not for pseudo-filesystem inodes. For guest_memfd, this allows khugepaged and MADV_COLLAPSE to create large folios in the page cache via the collapse path, but the guest_memfd fault handler does not support large folios. This triggers WARN_ON_ONCE(folio_test_large(folio)) in kvm_gmem_fault_user_mapping(). For secretmem, collapse_file() tries to copy page contents through the direct map, but secretmem pages are removed from the direct map. This can result in a kernel crash: BUG: unable to handle page fault for address: ffff88810284d000 RIP: 0010:memcpy_orig+0x16/0x130 Call Trace: collapse_file hpage_collapse_scan_file madvise_collapse Secretmem is not affected by the crash on upstream as the memory failure recovery handles the failed copy gracefully, but it still triggers confusing false memory failure reports: Memory failure: 0x106d96f: recovery action for clean unevictable LRU page: Recovered Check IS_ANON_FILE(inode) in file_thp_enabled() to deny THP for all anonymous inode files.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/08de46a75f91a6661…
https://git.kernel.org/stable/c/0524ee56af2c9bfba…
https://git.kernel.org/stable/c/f6fa05f0dddd38741…
https://git.kernel.org/stable/c/dd085fe9a8ebfc5d1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7fbb5e188248c50f737720825da1864ce42536d1 , < 08de46a75f91a6661bc1ce0a93614f4bc313c581 (git) Affected: 7fbb5e188248c50f737720825da1864ce42536d1 , < 0524ee56af2c9bfbad152a810f1ca95de8ca00d7 (git) Affected: 7fbb5e188248c50f737720825da1864ce42536d1 , < f6fa05f0dddd387417d0c28281ddb951582514d6 (git) Affected: 7fbb5e188248c50f737720825da1864ce42536d1 , < dd085fe9a8ebfc5d10314c60452db38d2b75e609 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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JSON

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CVE-2026-23392 (GCVE-0-2026-23392)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:33 – Updated: 2026-09-08 08:45

Title

netfilter: nf_tables: release flowtable after rcu grace period on error

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d2632de96ccb066e0…
https://git.kernel.org/stable/c/adee3436ccd29f1e5…
https://git.kernel.org/stable/c/7e3955b282eae20d6…
https://git.kernel.org/stable/c/c8092edb9a11f20f9…
https://git.kernel.org/stable/c/e78a2dcc7cfb87b64…
https://git.kernel.org/stable/c/d73f4b53aaaea4c95…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

8 products

Vendor	Product	Version
Linux	Linux	Affected: 3b49e2e94e6ebb8b23d0955d9e898254455734f8 , < d2632de96ccb066e0131ad1494241b9c281c60b8 (git) Affected: 3b49e2e94e6ebb8b23d0955d9e898254455734f8 , < adee3436ccd29f1e514c028899e400cbc6d84065 (git) Affected: 3b49e2e94e6ebb8b23d0955d9e898254455734f8 , < 7e3955b282eae20d61c75e499c75eade51c20060 (git) Affected: 3b49e2e94e6ebb8b23d0955d9e898254455734f8 , < c8092edb9a11f20f95ccceeb9422b7dd0df337bd (git) Affected: 3b49e2e94e6ebb8b23d0955d9e898254455734f8 , < e78a2dcc7cfb87b64a631441ca7681492b347ef6 (git) Affected: 3b49e2e94e6ebb8b23d0955d9e898254455734f8 , < d73f4b53aaaea4c95f245e491aa5eeb8a21874ce (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

Show details on NVD website

JSON

To clipboard

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CVE-2026-23455 (GCVE-0-2026-23455)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-09-08 08:46

Title

netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() In DecodeQ931(), the UserUserIE code path reads a 16-bit length from the packet, then decrements it by 1 to skip the protocol discriminator byte before passing it to DecodeH323_UserInformation(). If the encoded length is 0, the decrement wraps to -1, which is then passed as a large value to the decoder, leading to an out-of-bounds read. Add a check to ensure len is positive after the decrement.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root

References

10 references

URL	Tags
https://git.kernel.org/stable/c/2121f5fbe88daff0f…
https://git.kernel.org/stable/c/65fa92f79677858b1…
https://git.kernel.org/stable/c/495e97af9e7249ee0…
https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36…
https://git.kernel.org/stable/c/633e8f87dad32263f…
https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1…
https://git.kernel.org/stable/c/b652b05d51003ac07…
https://git.kernel.org/stable/c/f173d0f4c0f689173…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

8 products

Vendor	Product	Version
Linux	Linux	Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < 2121f5fbe88daff0f1fc5bc47d359426c74b86b0 (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < 65fa92f79677858b14b9e4b7275f26639afe2710 (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < 495e97af9e7249ee02b72bb1d0848a6efc3700f4 (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < f5e4f4e4cdb75ec36802059a94195a31f193da60 (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < 633e8f87dad32263f6a57dccdb873f042c062111 (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < 9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8 (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < b652b05d51003ac074b912684f9ec7486231717b (git) Affected: 5e35941d990123f155b02d5663e51a24f816b6f3 , < f173d0f4c0f689173f8cdac79991043a4a89bf66 (git)
Linux	Linux	Affected: 2.6.17 Unaffected: 0 , < 2.6.17 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

Show details on NVD website

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CVE-2026-31684 (GCVE-0-2026-31684)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:47 – Updated: 2026-06-01 16:13

Title

net: sched: act_csum: validate nested VLAN headers

Summary

In the Linux kernel, the following vulnerability has been resolved: net: sched: act_csum: validate nested VLAN headers tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without first ensuring that the full VLAN header is present in the linear area. If only part of an inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the following skb_pull(VLAN_HLEN) may violate skb invariants. Fix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully available, drop the packet through the existing error path.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/0410c619e86551677…
https://git.kernel.org/stable/c/886469b6455611a51…
https://git.kernel.org/stable/c/46c07ad50fa2f4ba7…
https://git.kernel.org/stable/c/eb3765b90eb8f2a3d…
https://git.kernel.org/stable/c/a69738efea0996d05…
https://git.kernel.org/stable/c/ec4930979b3f7bbeb…
https://git.kernel.org/stable/c/3d165d975305cf76f…
https://git.kernel.org/stable/c/c842743d073bdd683…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < 0410c619e86551677fb79887a38eccad3f5a0725 (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < 886469b6455611a511aa6013e957e15e50577513 (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < 46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09 (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2 (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < a69738efea0996d05a3c7d2178551b891744df1b (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < ec4930979b3f7bbeb7af5744599fc6603a4dba62 (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < 3d165d975305cf76ff0b10a3c798fb31e5f5f9a5 (git) Affected: 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 , < c842743d073bdd683606cb414eb0ca84465dd834 (git) Affected: 3764bfae5056e95617b6ee074129297e11710886 (git) Affected: 4.19.99 , < 4.20 (semver)
Linux	Linux	Affected: 5.1 Unaffected: 0 , < 5.1 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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CVE-2026-31685 (GCVE-0-2026-31685)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:47 – Updated: 2026-08-05 12:24

Title

netfilter: ip6t_eui64: reject invalid MAC header for all packets

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets `eui64_mt6()` derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address. The existing guard only rejects an invalid MAC header when `par->fragoff != 0`. For packets with `par->fragoff == 0`, `eui64_mt6()` can still reach `eth_hdr(skb)` even when the MAC header is not valid. Fix this by removing the `par->fragoff != 0` condition so that packets with an invalid MAC header are rejected before accessing `eth_hdr(skb)`.

Severity

9.4 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/4d75bc2cd093bf580…
https://git.kernel.org/stable/c/7d6a57411caf54df0…
https://git.kernel.org/stable/c/d5603591373441fec…
https://git.kernel.org/stable/c/288138418bef956f8…
https://git.kernel.org/stable/c/9eda5478746ef7dc0…
https://git.kernel.org/stable/c/807d6ee15804df6f0…
https://git.kernel.org/stable/c/309ae3e9a51a69699…
https://git.kernel.org/stable/c/fdce0b3590f724540…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4d75bc2cd093bf5803edf512c099bfb220fd6459 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7d6a57411caf54df025860c9b1a82cd42d57a562 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d5603591373441fecf9951833d6d873e09320f08 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 288138418bef956f8b295751a4536c60f0e89f4a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9eda5478746ef7dc0e4e537b5a5e4b0ca1027091 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 807d6ee15804df6f01a35c910f09612e858739a6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 309ae3e9a51a69699ca94eac5fac5688fa562d55 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fdce0b3590f724540795b874b4c8850c90e6b0a8 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/ip6t_eui64.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_eui64: reject invalid MAC header for all packets\n\n`eui64_mt6()` derives a modified EUI-64 from the Ethernet source address\nand compares it with the low 64 bits of the IPv6 source address.\n\nThe existing guard only rejects an invalid MAC header when\n`par-\u003efragoff != 0`. For packets with `par-\u003efragoff == 0`, `eui64_mt6()`\ncan still reach `eth_hdr(skb)` even when the MAC header is not valid.\n\nFix this by removing the `par-\u003efragoff != 0` condition so that packets\nwith an invalid MAC header are rejected before accessing `eth_hdr(skb)`."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.4,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable match runs from IPv6 netfilter PREROUTING/LOCAL_IN/FORWARD packet hooks, so a remote peer can reach it by sending IPv6 traffic to or through a host/router with an active eui64 xtables rule on a path with an invalid or absent Ethernet MAC header.\nAC:L - There is no race or timing requirement; the attacker can send first-fragment or non-fragment IPv6 packets with controlled header fields, and the active rule/interface combination is a deployment precondition.\nPR:N - Although installing the rule requires CAP_NET_ADMIN, in the highest-severity reasonable deployment the eui64 rule is already active and unauthenticated packets trigger the vulnerable packet path without attacker privileges.\nUI:N - No victim action is needed after the affected netfilter rule is present; packet delivery alone invokes the match.\nS:U - The impact remains within the kernel/networking security authority of the affected system and does not cross a VM, IOMMU, or similar boundary.\nC:H - With an unset or invalid MAC header, eth_hdr() can read outside the valid Ethernet header area and those bytes can influence observable netfilter behavior; following the required conservative rule for out-of-bounds reads, confidentiality is High.\nI:L - The bug can cause invalid-L2 packets to satisfy an eui64 match and bypass filtering decisions based on Ethernet-source-to-IPv6-source binding, but it does not provide a direct kernel write primitive.\nA:H - Invalid eth_hdr() access on packets with no valid MAC header can produce kernel warnings/oopses or KASAN-detected out-of-bounds accesses, and an attacker can repeat packet delivery to sustain denial of service."
            }
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        }
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        "dateUpdated": "2026-08-05T12:24:29.973Z",
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          "url": "https://git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562"
        },
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          "url": "https://git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08"
        },
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          "url": "https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a"
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          "url": "https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091"
        },
        {
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8"
        }
      ],
      "title": "netfilter: ip6t_eui64: reject invalid MAC header for all packets",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31685",
    "datePublished": "2026-04-25T08:47:02.857Z",
    "dateReserved": "2026-03-09T15:48:24.131Z",
    "dateUpdated": "2026-08-05T12:24:29.973Z",
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CVE-2026-43006 (GCVE-0-2026-43006)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-08-05 12:25

Title

io_uring/rsrc: reject zero-length fixed buffer import

Summary

In the Linux kernel, the following vulnerability has been resolved: io_uring/rsrc: reject zero-length fixed buffer import validate_fixed_range() admits buf_addr at the exact end of the registered region when len is zero, because the check uses strict greater-than (buf_end > imu->ubuf + imu->len). io_import_fixed() then computes offset == imu->len, which causes the bvec skip logic to advance past the last bio_vec entry and read bv_offset from out-of-bounds slab memory. Return early from io_import_fixed() when len is zero. A zero-length import has no data to transfer and should not walk the bvec array at all. BUG: KASAN: slab-out-of-bounds in io_import_reg_buf+0x697/0x7f0 Read of size 4 at addr ffff888002bcc254 by task poc/103 Call Trace: io_import_reg_buf+0x697/0x7f0 io_write_fixed+0xd9/0x250 __io_issue_sqe+0xad/0x710 io_issue_sqe+0x7d/0x1100 io_submit_sqes+0x86a/0x23c0 __do_sys_io_uring_enter+0xa98/0x1590 Allocated by task 103: The buggy address is located 12 bytes to the right of allocated 584-byte region [ffff888002bcc000, ffff888002bcc248)

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/040a1e7e0e2f01851…
https://git.kernel.org/stable/c/40170fc1a79c1b2e6…
https://git.kernel.org/stable/c/111a12b422a8cfa93…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8622b20f23ed165f48b8ca61503a107d17f8d585 , < 040a1e7e0e2f01851fec1dd2d96906f8636a9f75 (git) Affected: 8622b20f23ed165f48b8ca61503a107d17f8d585 , < 40170fc1a79c1b2e68f09ae6aac687b7305ae6f4 (git) Affected: 8622b20f23ed165f48b8ca61503a107d17f8d585 , < 111a12b422a8cfa93deabaef26fec48237163214 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
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          "programFiles": [
            "io_uring/rsrc.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: reject zero-length fixed buffer import\n\nvalidate_fixed_range() admits buf_addr at the exact end of the\nregistered region when len is zero, because the check uses strict\ngreater-than (buf_end \u003e imu-\u003eubuf + imu-\u003elen).  io_import_fixed()\nthen computes offset == imu-\u003elen, which causes the bvec skip logic\nto advance past the last bio_vec entry and read bv_offset from\nout-of-bounds slab memory.\n\nReturn early from io_import_fixed() when len is zero.  A zero-length\nimport has no data to transfer and should not walk the bvec array\nat all.\n\n  BUG: KASAN: slab-out-of-bounds in io_import_reg_buf+0x697/0x7f0\n  Read of size 4 at addr ffff888002bcc254 by task poc/103\n  Call Trace:\n   io_import_reg_buf+0x697/0x7f0\n   io_write_fixed+0xd9/0x250\n   __io_issue_sqe+0xad/0x710\n   io_issue_sqe+0x7d/0x1100\n   io_submit_sqes+0x86a/0x23c0\n   __do_sys_io_uring_enter+0xa98/0x1590\n  Allocated by task 103:\n  The buggy address is located 12 bytes to the right of\n   allocated 584-byte region [ffff888002bcc000, ffff888002bcc248)"
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CVE-2026-43020 (GCVE-0-2026-43020)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-11 22:16

Title

Bluetooth: MGMT: validate LTK enc_size on load

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate LTK enc_size on load Load Long Term Keys stores the user-provided enc_size and later uses it to size fixed-size stack operations when replying to LE LTK requests. An enc_size larger than the 16-byte key buffer can therefore overflow the reply stack buffer. Reject oversized enc_size values while validating the management LTK record so invalid keys never reach the stored key state.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/0f37d1e65c6d71ad9…
https://git.kernel.org/stable/c/257cdb960d8ff6d60…
https://git.kernel.org/stable/c/c34577f517b556fb6…
https://git.kernel.org/stable/c/f71695e81f4cb428f…
https://git.kernel.org/stable/c/82f342b3b006ca1d6…
https://git.kernel.org/stable/c/50fb64defa72a3fec…
https://git.kernel.org/stable/c/40ba329e8b4cd2fb1…
https://git.kernel.org/stable/c/b8dbe9648d69059cf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < 0f37d1e65c6d71ad94ccfb5c602163c525db789d (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < 257cdb960d8ff6d60bb6461b03c814b6cf0c9e64 (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < c34577f517b556fb6ca173d45bf7e766ae2564ce (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < f71695e81f4cb428f3c7e2138eae88199005b52c (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < 82f342b3b006ca1d65f4890c05f2ec32fcb808b6 (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < 50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257 (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < 40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009 (git) Affected: 346af67b8d116f01ef696fd47959a55deb2db8b6 , < b8dbe9648d69059cfe3a28917bfbf7e61efd7f15 (git)
Linux	Linux	Affected: 3.4 Unaffected: 0 , < 3.4 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate LTK enc_size on load\n\nLoad Long Term Keys stores the user-provided enc_size and later uses\nit to size fixed-size stack operations when replying to LE LTK\nrequests. An enc_size larger than the 16-byte key buffer can therefore\noverflow the reply stack buffer.\n\nReject oversized enc_size values while validating the management LTK\nrecord so invalid keys never reach the stored key state."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:16:09.294Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d"
        },
        {
          "url": "https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64"
        },
        {
          "url": "https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c"
        },
        {
          "url": "https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257"
        },
        {
          "url": "https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15"
        }
      ],
      "title": "Bluetooth: MGMT: validate LTK enc_size on load",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43020",
    "datePublished": "2026-05-01T14:15:23.699Z",
    "dateReserved": "2026-05-01T14:12:55.975Z",
    "dateUpdated": "2026-05-11T22:16:09.294Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-43023 (GCVE-0-2026-43023)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-08-05 12:25

Title

Bluetooth: SCO: fix race conditions in sco_sock_connect()

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: fix race conditions in sco_sock_connect() sco_sock_connect() checks sk_state and sk_type without holding the socket lock. Two concurrent connect() syscalls on the same socket can both pass the check and enter sco_connect(), leading to use-after-free. The buggy scenario involves three participants and was confirmed with additional logging instrumentation: Thread A (connect): HCI disconnect: Thread B (connect): sco_sock_connect(sk) sco_sock_connect(sk) sk_state==BT_OPEN sk_state==BT_OPEN (pass, no lock) (pass, no lock) sco_connect(sk): sco_connect(sk): hci_dev_lock hci_dev_lock hci_connect_sco <- blocked -> hcon1 sco_conn_add->conn1 lock_sock(sk) sco_chan_add: conn1->sk = sk sk->conn = conn1 sk_state=BT_CONNECT release_sock hci_dev_unlock hci_dev_lock sco_conn_del: lock_sock(sk) sco_chan_del: sk->conn=NULL conn1->sk=NULL sk_state= BT_CLOSED SOCK_ZAPPED release_sock hci_dev_unlock (unblocked) hci_connect_sco -> hcon2 sco_conn_add -> conn2 lock_sock(sk) sco_chan_add: sk->conn=conn2 sk_state= BT_CONNECT // zombie sk! release_sock hci_dev_unlock Thread B revives a BT_CLOSED + SOCK_ZAPPED socket back to BT_CONNECT. Subsequent cleanup triggers double sock_put() and use-after-free. Meanwhile conn1 is leaked as it was orphaned when sco_conn_del() cleared the association. Fix this by: - Moving lock_sock() before the sk_state/sk_type checks in sco_sock_connect() to serialize concurrent connect attempts - Fixing the sk_type != SOCK_SEQPACKET check to actually return the error instead of just assigning it - Adding a state re-check in sco_connect() after lock_sock() to catch state changes during the window between the locks - Adding sco_pi(sk)->conn check in sco_chan_add() to prevent double-attach of a socket to multiple connections - Adding hci_conn_drop() on sco_chan_add failure to prevent HCI connection leaks

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/dabf22269242e2f2b…
https://git.kernel.org/stable/c/adb90cd0f9f7a8d43…
https://git.kernel.org/stable/c/7e296ffdab5bdab71…
https://git.kernel.org/stable/c/98c8d3bfdaa657d8f…
https://git.kernel.org/stable/c/d002bd11024bd231b…
https://git.kernel.org/stable/c/8a5b0135d4a5d9683…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 70a13b1e25fef37c87c8a1228ddb8900efbca7cf , < dabf22269242e2f2bf44c43fcdc2fa763df7f9cc (git) Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < adb90cd0f9f7a8d438fcb93354040fbafc5ae2a0 (git) Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < 7e296ffdab5bdab718dff7c14288fdcb9154fa27 (git) Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < 98c8d3bfdaa657d8f472dbbebd7ea8cd816d8a8d (git) Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < d002bd11024bd231bcb606877e33951ffb7bed14 (git) Affected: 9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 , < 8a5b0135d4a5d9683203a3d9a12a711ccec5936b (git) Affected: 6.1.109 , < 6.1.168 (semver)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/sco.c"
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          "vendor": "Linux",
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              "version": "6.18.22",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: fix race conditions in sco_sock_connect()\n\nsco_sock_connect() checks sk_state and sk_type without holding\nthe socket lock. Two concurrent connect() syscalls on the same\nsocket can both pass the check and enter sco_connect(), leading\nto use-after-free.\n\nThe buggy scenario involves three participants and was confirmed\nwith additional logging instrumentation:\n\n  Thread A (connect):    HCI disconnect:      Thread B (connect):\n\n  sco_sock_connect(sk)                        sco_sock_connect(sk)\n  sk_state==BT_OPEN                           sk_state==BT_OPEN\n  (pass, no lock)                             (pass, no lock)\n  sco_connect(sk):                            sco_connect(sk):\n    hci_dev_lock                                hci_dev_lock\n    hci_connect_sco                               \u003c- blocked\n      -\u003e hcon1\n    sco_conn_add-\u003econn1\n    lock_sock(sk)\n    sco_chan_add:\n      conn1-\u003esk = sk\n      sk-\u003econn = conn1\n    sk_state=BT_CONNECT\n    release_sock\n    hci_dev_unlock\n                           hci_dev_lock\n                           sco_conn_del:\n                             lock_sock(sk)\n                             sco_chan_del:\n                               sk-\u003econn=NULL\n                               conn1-\u003esk=NULL\n                               sk_state=\n                                 BT_CLOSED\n                               SOCK_ZAPPED\n                             release_sock\n                           hci_dev_unlock\n                                                  (unblocked)\n                                                  hci_connect_sco\n                                                    -\u003e hcon2\n                                                  sco_conn_add\n                                                    -\u003e conn2\n                                                  lock_sock(sk)\n                                                  sco_chan_add:\n                                                    sk-\u003econn=conn2\n                                                  sk_state=\n                                                    BT_CONNECT\n                                                  // zombie sk!\n                                                  release_sock\n                                                  hci_dev_unlock\n\nThread B revives a BT_CLOSED + SOCK_ZAPPED socket back to\nBT_CONNECT. Subsequent cleanup triggers double sock_put() and\nuse-after-free. Meanwhile conn1 is leaked as it was orphaned\nwhen sco_conn_del() cleared the association.\n\nFix this by:\n- Moving lock_sock() before the sk_state/sk_type checks in\n  sco_sock_connect() to serialize concurrent connect attempts\n- Fixing the sk_type != SOCK_SEQPACKET check to actually\n  return the error instead of just assigning it\n- Adding a state re-check in sco_connect() after lock_sock()\n  to catch state changes during the window between the locks\n- Adding sco_pi(sk)-\u003econn check in sco_chan_add() to prevent\n  double-attach of a socket to multiple connections\n- Adding hci_conn_drop() on sco_chan_add failure to prevent\n  HCI connection leaks"
        }
      ],
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            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached through the local connect() syscall on an AF_BLUETOOTH/SCO socket. A Bluetooth peer or HCI disconnect can influence timing, but an adjacent attacker alone cannot race two connect() calls on the same local socket.\nAC:L - The attacker can create the race by issuing concurrent connect() syscalls on the same socket and repeating attempts while the normal HCI failure/disconnect path runs. Under the higher-severity rule, this attacker-controlled race is Low complexity.\nPR:L - SCO socket creation and connect do not impose a capability check, though AF_BLUETOOTH is limited to init_net rather than unprivileged network namespaces. A basic unprivileged local user on the host can open and race BTPROTO_SCO sockets.\nUI:N - No victim action is required once the attacker can run local code. The attacker directly invokes socket/connect operations and can repeat the race.\nS:U - The bug corrupts kernel Bluetooth socket/connection state within the same kernel security authority. It is a standard local kernel compromise/DoS path, not a VM escape or cross-scope boundary bypass.\nC:H - The race leads to a use-after-free/double sock_put on kernel socket objects. Kernel UAFs are defensibly scored as high confidentiality impact because freed objects can be reused for information disclosure primitives.\nI:H - The same UAF/double-free condition can be leveraged through heap reuse and spraying to corrupt kernel objects or control flow. Under the required guidance, UAF memory corruption is High integrity impact.\nA:H - Even without full exploitation, the double sock_put/use-after-free can crash or destabilize the kernel. Kernel crashes and UAF-triggered oops/panic conditions are High availability impact."
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          "url": "https://git.kernel.org/stable/c/8a5b0135d4a5d9683203a3d9a12a711ccec5936b"
        }
      ],
      "title": "Bluetooth: SCO: fix race conditions in sco_sock_connect()",
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        "engine": "bippy-1.2.0"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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