RHSA-2026:6954
Vulnerability from csaf_redhat - Published: 2026-04-08 03:38 - Updated: 2026-04-08 19:38Summary
Red Hat Security Advisory: kernel security update
Severity
Moderate
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180)
* kernel: Linux kernel:A use-after-free in bridge multicast in br_multicast_port_ctx_init (CVE-2025-38248)
* kernel: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064)
* kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match() (CVE-2025-40168)
* kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001)
* kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209)
* kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation. (CVE-2025-71238)
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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the Linux kernel's Asynchronous Transfer Mode (ATM) subsystem. An authenticated local attacker could exploit a Use-After-Free (UAF) vulnerability in the /proc/net/atm/lec handling. This flaw occurs due to improper dev_put() calls without prior dev_hold() calls, leading to an imbalance in reference counting. Successful exploitation could allow the attacker to achieve privilege escalation or cause a denial of service.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
A flaw was found in the Linux kernel's bridge multicast functionality. A local user could trigger a use-after-free vulnerability, a type of memory corruption, by improperly configuring network bridge router ports. This issue arises because the system fails to correctly remove ports from its internal router port lists, leading to references to freed memory. Exploiting this flaw could result in system instability, denial of service, or potentially allow for privilege escalation.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in __pnet_find_base_ndev(). syzbot reported use-after-free of net_device in __pnet_find_base_ndev(), which was called during connect(). [0] smc_pnet_find_ism_resource() fetches sk_dst_get(sk)->dev and passes down to pnet_find_base_ndev(), where RTNL is held. Then, UAF happened at __pnet_find_base_ndev() when the dev is first used. This means dev had already been freed before acquiring RTNL in pnet_find_base_ndev(). While dev is going away, dst->dev could be swapped with blackhole_netdev, and the dev's refcnt by dst will be released. We must hold dev's refcnt before calling smc_pnet_find_ism_resource(). Also, smc_pnet_find_roce_resource() has the same problem. Let's use __sk_dst_get() and dst_dev_rcu() in the two functions. [0]: BUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 Read of size 1 at addr ffff888036bac33a by task syz.0.3632/18609 CPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926 pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline] smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline] smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154 smc_find_ism_device net/smc/af_smc.c:1030 [inline] smc_find_proposal_devices net/smc/af_smc.c:1115 [inline] __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545 smc_connect+0x877/0xd90 net/smc/af_smc.c:1715 __sys_connect_file net/socket.c:2086 [inline] __sys_connect+0x313/0x440 net/socket.c:2105 __do_sys_connect net/socket.c:2111 [inline] __se_sys_connect net/socket.c:2108 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2108 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f47cbf8eba9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9 RDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b RBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8 </TASK> The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000 raw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741 (syz-executor), ts 343313197788, free_ts 380670750466 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348 __do_kmalloc_node mm/slub.c:4364 [inline] __kvmalloc_node ---truncated---
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
A flaw was found in the Linux kernel’s SMC (Shared Memory Communication) module: in smc_clc_prfx_match(), the function is called from smc_listen_work() without proper RCU or RTNL protection. The code previously used sk_dst_get(sk)->dev, which can lead to a use-after-free (UAF) condition if the sk’s destination is freed concurrently.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw was found in the Linux kernel's `qla2xxx` block SCSI generic (bsg) interface. This vulnerability, a double free, occurs because certain vendor-specific handlers incorrectly call the `bsg_job_done` function on both successful and failed operation paths. A local user could exploit this to trigger memory corruption, leading to a kernel crash and a Denial of Service (DoS). There is also a theoretical risk of local privilege escalation due to the memory corruption.
7.3 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
Workaround
To mitigate this issue, prevent module qla2xxx from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u
7.8 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
Workaround
To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
A use-after-free vulnerability was found in the macvlan driver. When creating a macvlan interface in source mode fails after the source MAC has been added to the hash table (e.g., due to an invalid interface name), the hash entry still references the freed net_device structure. Subsequent packets matching that source MAC trigger use-after-free in macvlan_forward_source().
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2026:6954
Workaround
To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
References
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"name": "Improper Update of Reference Count"
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"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Asynchronous Transfer Mode (ATM) subsystem. An authenticated local attacker could exploit a Use-After-Free (UAF) vulnerability in the /proc/net/atm/lec handling. This flaw occurs due to improper dev_put() calls without prior dev_hold() calls, leading to an imbalance in reference counting. Successful exploitation could allow the attacker to achieve privilege escalation or cause a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-38180"
},
{
"category": "external",
"summary": "RHBZ#2376376",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376376"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38180",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38180"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38180",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38180"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025070410-CVE-2025-38180-c6d0@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025070410-CVE-2025-38180-c6d0@gregkh/T"
}
],
"release_date": "2025-07-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:6954"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem"
},
{
"cve": "CVE-2025-38248",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2025-07-09T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2378981"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s bridge multicast functionality. A local user could trigger a use-after-free vulnerability, a type of memory corruption, by improperly configuring network bridge router ports. This issue arises because the system fails to correctly remove ports from its internal router port lists, leading to references to freed memory. Exploiting this flaw could result in system instability, denial of service, or potentially allow for privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel:A use-after-free in bridge multicast in br_multicast_port_ctx_init",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-38248"
},
{
"category": "external",
"summary": "RHBZ#2378981",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2378981"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38248",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38248"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38248",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38248"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025070934-CVE-2025-38248-003c@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025070934-CVE-2025-38248-003c@gregkh/T"
}
],
"release_date": "2025-07-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2026:6954"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: Linux kernel:A use-after-free in bridge multicast in br_multicast_port_ctx_init"
},
{
"cve": "CVE-2025-40064",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2025-10-28T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2406747"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmc: Fix use-after-free in __pnet_find_base_ndev().\n\nsyzbot reported use-after-free of net_device in __pnet_find_base_ndev(),\nwhich was called during connect(). [0]\n\nsmc_pnet_find_ism_resource() fetches sk_dst_get(sk)-\u003edev and passes\ndown to pnet_find_base_ndev(), where RTNL is held. Then, UAF happened\nat __pnet_find_base_ndev() when the dev is first used.\n\nThis means dev had already been freed before acquiring RTNL in\npnet_find_base_ndev().\n\nWhile dev is going away, dst-\u003edev could be swapped with blackhole_netdev,\nand the dev\u0027s refcnt by dst will be released.\n\nWe must hold dev\u0027s refcnt before calling smc_pnet_find_ism_resource().\n\nAlso, smc_pnet_find_roce_resource() has the same problem.\n\nLet\u0027s use __sk_dst_get() and dst_dev_rcu() in the two functions.\n\n[0]:\nBUG: KASAN: use-after-free in __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\nRead of size 1 at addr ffff888036bac33a by task syz.0.3632/18609\n\nCPU: 1 UID: 0 PID: 18609 Comm: syz.0.3632 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n __pnet_find_base_ndev+0x1b1/0x1c0 net/smc/smc_pnet.c:926\n pnet_find_base_ndev net/smc/smc_pnet.c:946 [inline]\n smc_pnet_find_ism_by_pnetid net/smc/smc_pnet.c:1103 [inline]\n smc_pnet_find_ism_resource+0xef/0x390 net/smc/smc_pnet.c:1154\n smc_find_ism_device net/smc/af_smc.c:1030 [inline]\n smc_find_proposal_devices net/smc/af_smc.c:1115 [inline]\n __smc_connect+0x372/0x1890 net/smc/af_smc.c:1545\n smc_connect+0x877/0xd90 net/smc/af_smc.c:1715\n __sys_connect_file net/socket.c:2086 [inline]\n __sys_connect+0x313/0x440 net/socket.c:2105\n __do_sys_connect net/socket.c:2111 [inline]\n __se_sys_connect net/socket.c:2108 [inline]\n __x64_sys_connect+0x7a/0x90 net/socket.c:2108\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f47cbf8eba9\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f47ccdb1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a\nRAX: ffffffffffffffda RBX: 00007f47cc1d5fa0 RCX: 00007f47cbf8eba9\nRDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000b\nRBP: 00007f47cc011e19 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f47cc1d6038 R14: 00007f47cc1d5fa0 R15: 00007ffc512f8aa8\n \u003c/TASK\u003e\n\nThe buggy address belongs to the physical page:\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888036bacd00 pfn:0x36bac\nflags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)\nraw: 00fff00000000000 ffffea0001243d08 ffff8880b863fdc0 0000000000000000\nraw: ffff888036bacd00 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\npage_owner tracks the page as freed\npage last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 16741, tgid 16741 (syz-executor), ts 343313197788, free_ts 380670750466\n set_page_owner include/linux/page_owner.h:32 [inline]\n post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851\n prep_new_page mm/page_alloc.c:1859 [inline]\n get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858\n __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148\n alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416\n ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4317\n __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4348\n __do_kmalloc_node mm/slub.c:4364 [inline]\n __kvmalloc_node\n---truncated---",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: smc: Fix use-after-free in __pnet_find_base_ndev()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40064"
},
{
"category": "external",
"summary": "RHBZ#2406747",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406747"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40064",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40064"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40064",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40064"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025102817-CVE-2025-40064-0c16@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025102817-CVE-2025-40064-0c16@gregkh/T"
}
],
"release_date": "2025-10-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:6954"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: smc: Fix use-after-free in __pnet_find_base_ndev()"
},
{
"cve": "CVE-2025-40168",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-11-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2414482"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u2019s SMC (Shared Memory Communication) module: in smc_clc_prfx_match(), the function is called from smc_listen_work() without proper RCU or RTNL protection. The code previously used sk_dst_get(sk)-\u003edev, which can lead to a use-after-free (UAF) condition if the sk\u2019s destination is freed concurrently.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40168"
},
{
"category": "external",
"summary": "RHBZ#2414482",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414482"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40168",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40168"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40168",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40168"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40168-bdd5@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40168-bdd5@gregkh/T"
}
],
"release_date": "2025-11-12T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
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"details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match()"
},
{
"cve": "CVE-2025-71238",
"cwe": {
"id": "CWE-672",
"name": "Operation on a Resource after Expiration or Release"
},
"discovery_date": "2026-03-04T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2444398"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s `qla2xxx` block SCSI generic (bsg) interface. This vulnerability, a double free, occurs because certain vendor-specific handlers incorrectly call the `bsg_job_done` function on both successful and failed operation paths. A local user could exploit this to trigger memory corruption, leading to a kernel crash and a Denial of Service (DoS). There is also a theoretical risk of local privilege escalation due to the memory corruption.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation.",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A kernel double free can be triggered in the qla2xxx bsg interface because some vendor specific handlers called bsg_job_done on both success and failure paths. This can result in the same bsg job being completed and freed twice which leads to memory corruption and a kernel crash. The issue is not network reachable. Impact is denial of service and there is a theoretical risk of local privilege escalation because the flaw is a kernel memory corruption condition.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-71238"
},
{
"category": "external",
"summary": "RHBZ#2444398",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2444398"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-71238",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-71238"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-71238",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71238"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026030437-CVE-2025-71238-76bc@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026030437-CVE-2025-71238-76bc@gregkh/T"
}
],
"release_date": "2026-03-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:6954"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent module qla2xxx from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation."
},
{
"cve": "CVE-2026-23001",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2026-01-25T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2432664"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix possible UAF in macvlan_forward_source()\n\nAdd RCU protection on (struct macvlan_source_entry)-\u003evlan.\n\nWhenever macvlan_hash_del_source() is called, we must clear\nentry-\u003evlan pointer before RCU grace period starts.\n\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\n\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: macvlan: fix possible UAF in macvlan_forward_source()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A use-after-free can occur in macvlan source-mode forwarding when a source hash entry is deleted while the transmit/forwarding path still dereferences entry.vlan without proper RCU protection. A local attacker who can configure macvlan networking can race deletion with packet processing to crash the kernel and potentially achieve memory corruption.\nExploitation typically requires the CAP_NET_ADMIN capability (often within a user namespace).",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-23001"
},
{
"category": "external",
"summary": "RHBZ#2432664",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432664"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-23001",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23001"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23001",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23001"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026012534-CVE-2026-23001-7ab0@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026012534-CVE-2026-23001-7ab0@gregkh/T"
}
],
"release_date": "2026-01-25T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:6954"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: macvlan: fix possible UAF in macvlan_forward_source()"
},
{
"cve": "CVE-2026-23209",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-02-14T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2439900"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in the macvlan driver. When creating a macvlan interface in source mode fails after the source MAC has been added to the hash table (e.g., due to an invalid interface name), the hash entry still references the freed net_device structure. Subsequent packets matching that source MAC trigger use-after-free in macvlan_forward_source().",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: macvlan: fix error recovery in macvlan_common_newlink()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability can be exploited by a local user with CAP_NET_ADMIN to trigger use-after-free by creating a macvlan with an invalid name. The detailed reproducer and analysis were provided by a security researcher. This could potentially be used for privilege escalation via controlled memory corruption.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-23209"
},
{
"category": "external",
"summary": "RHBZ#2439900",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439900"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-23209",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23209"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23209",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23209"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026021439-CVE-2026-23209-9ad6@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026021439-CVE-2026-23209-9ad6@gregkh/T"
}
],
"release_date": "2026-02-14T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-08T03:38:11+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:6954"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: macvlan: fix error recovery in macvlan_common_newlink()"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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