Vulnerability-Lookup

RHSA-2025:3095

Vulnerability from csaf_redhat - Published: 2025-03-20 19:19 - Updated: 2026-09-12 12:19

Summary

Red Hat Security Advisory: kpatch-patch-4_18_0-372_118_1, kpatch-patch-4_18_0-372_131_1, kpatch-patch-4_18_0-372_137_1, and kpatch-patch-4_18_0-372_91_1 security update

Severity

Important

Notes

Topic: An update for kpatch-patch-4_18_0-372_118_1, kpatch-patch-4_18_0-372_131_1, kpatch-patch-4_18_0-372_137_1, and kpatch-patch-4_18_0-372_91_1 is now available for Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. 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: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-372.91.1.el8_6. Security Fix(es): * kernel: can: bcm: Fix UAF in bcm_proc_show() (CVE-2023-52922) 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.

CVE-2023-52922

A flaw was found in the Linux kernel's Controller Area Network (CAN) Broadcast Manager (BCM) module. A local attacker with low privileges could exploit a use-after-free vulnerability in the `bcm_proc_show()` function. This occurs because the `bcm_op` object is freed before its corresponding procfs entry is removed, allowing a subsequent read operation to access freed memory. This flaw could lead to a denial of service, information disclosure, or potentially arbitrary code execution and privilege escalation.

7.8 (High)


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

CWE-416 - Use After Free

Affected products

Fixed 28 products

Product	Version	Remediation
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-0:1-5.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-0:1-5.el8_6.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-0:1-5.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-debuginfo-0:1-5.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-debuginfo-0:1-5.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-debugsource-0:1-5.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_118_1-debugsource-0:1-5.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-0:1-4.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-0:1-4.el8_6.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-0:1-4.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-debuginfo-0:1-4.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-debuginfo-0:1-4.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-debugsource-0:1-4.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_131_1-debugsource-0:1-4.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-0:1-1.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-0:1-1.el8_6.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-0:1-1.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-debuginfo-0:1-1.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-debuginfo-0:1-1.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-debugsource-0:1-1.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_137_1-debugsource-0:1-1.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-0:1-9.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-0:1-9.el8_6.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-0:1-9.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debuginfo-0:1-9.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debuginfo-0:1-9.el8_6.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debugsource-0:1-9.el8_6.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debugsource-0:1-9.el8_6.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2025:3095	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2329370	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2023-52922	self
https://bugzilla.redhat.com/show_bug.cgi?id=2329370	external
https://www.cve.org/CVERecord?id=CVE-2023-52922	external
https://nvd.nist.gov/vuln/detail/CVE-2023-52922	external
https://lore.kernel.org/linux-cve-announce/202411…	external

Acknowledgments

Allele Security Intelligence Anderson Nascimento

JSON

To clipboard

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          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "kernel: can: bcm: Fix UAF in bcm_proc_show()",
          "title": "Vulnerability summary"
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          "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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            "BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debuginfo-0:1-9.el8_6.ppc64le",
            "BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debuginfo-0:1-9.el8_6.x86_64",
            "BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debugsource-0:1-9.el8_6.ppc64le",
            "BaseOS-8.6.0.Z.E4S:kpatch-patch-4_18_0-372_91_1-debugsource-0:1-9.el8_6.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: can: bcm: Fix UAF in bcm_proc_show()"
    }
  ]
}

CVE-2023-52922 (GCVE-0-2023-52922)

Vulnerability from cvelistv5 – Published: 2024-11-28 15:09 – Updated: 2026-08-05 09:12

Title

can: bcm: Fix UAF in bcm_proc_show()

Summary

In the Linux kernel, the following vulnerability has been resolved: can: bcm: Fix UAF in bcm_proc_show() BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80 Read of size 8 at addr ffff888155846230 by task cat/7862 CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xd5/0x150 print_report+0xc1/0x5e0 kasan_report+0xba/0xf0 bcm_proc_show+0x969/0xa80 seq_read_iter+0x4f6/0x1260 seq_read+0x165/0x210 proc_reg_read+0x227/0x300 vfs_read+0x1d5/0x8d0 ksys_read+0x11e/0x240 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Allocated by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x9e/0xa0 bcm_sendmsg+0x264b/0x44e0 sock_sendmsg+0xda/0x180 ____sys_sendmsg+0x735/0x920 ___sys_sendmsg+0x11d/0x1b0 __sys_sendmsg+0xfa/0x1d0 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x161/0x1c0 slab_free_freelist_hook+0x119/0x220 __kmem_cache_free+0xb4/0x2e0 rcu_core+0x809/0x1bd0 bcm_op is freed before procfs entry be removed in bcm_release(), this lead to bcm_proc_show() may read the freed bcm_op.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-12-11 14:25 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/11b8e27ed448baa38…
https://git.kernel.org/stable/c/9b58d36d0c1ea29a9…
https://git.kernel.org/stable/c/9533dbfac0ff7edd7…
https://git.kernel.org/stable/c/cf254b4f68e480e73…
https://git.kernel.org/stable/c/3c3941bb1eb53abe7…
https://git.kernel.org/stable/c/995f47d76647708ec…
https://git.kernel.org/stable/c/dfd0aa26e9a07f2ce…
https://git.kernel.org/stable/c/55c3b96074f3f9b0a…
https://allelesecurity.com/use-after-free-vulnera…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 11b8e27ed448baa385d90154a141466bd5e92f18 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < cf254b4f68e480e73dab055014e002b77aed30ed (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 3c3941bb1eb53abe7d640ffee5c4d6b559829ab3 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 995f47d76647708ec26c6e388663ad4f3f264787 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7 (git) Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 55c3b96074f3f9b0aee19bf93cd71af7516582bb (git)
Linux	Linux	Affected: 2.6.25 Unaffected: 0 , < 2.6.25 (semver) Unaffected: 4.14.322 , ≤ 4.14.* (semver) Unaffected: 4.19.291 , ≤ 4.19.* (semver) Unaffected: 5.4.251 , ≤ 5.4.* (semver) Unaffected: 5.10.188 , ≤ 5.10.* (semver) Unaffected: 5.15.123 , ≤ 5.15.* (semver) Unaffected: 6.1.42 , ≤ 6.1.* (semver) Unaffected: 6.4.7 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix)

Show details on NVD website

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To clipboard

{
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.42",
              "versionType": "semver"
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              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.7",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: Fix UAF in bcm_proc_show()\n\nBUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80\nRead of size 8 at addr ffff888155846230 by task cat/7862\n\nCPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xd5/0x150\n print_report+0xc1/0x5e0\n kasan_report+0xba/0xf0\n bcm_proc_show+0x969/0xa80\n seq_read_iter+0x4f6/0x1260\n seq_read+0x165/0x210\n proc_reg_read+0x227/0x300\n vfs_read+0x1d5/0x8d0\n ksys_read+0x11e/0x240\n do_syscall_64+0x35/0xb0\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nAllocated by task 7846:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n __kasan_kmalloc+0x9e/0xa0\n bcm_sendmsg+0x264b/0x44e0\n sock_sendmsg+0xda/0x180\n ____sys_sendmsg+0x735/0x920\n ___sys_sendmsg+0x11d/0x1b0\n __sys_sendmsg+0xfa/0x1d0\n do_syscall_64+0x35/0xb0\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFreed by task 7846:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n kasan_save_free_info+0x27/0x40\n ____kasan_slab_free+0x161/0x1c0\n slab_free_freelist_hook+0x119/0x220\n __kmem_cache_free+0xb4/0x2e0\n rcu_core+0x809/0x1bd0\n\nbcm_op is freed before procfs entry be removed in bcm_release(),\nthis lead to bcm_proc_show() may read the freed bcm_op."
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              "value": "AV:L - The bug is reached via local syscalls\u2014socket(PF_CAN, SOCK_DGRAM, CAN_BCM), connect, sendmsg to create ops, read of /proc/net/can-bcm/\u003cino\u003e, and close\u2014not via remote packet processing.\nAC:L - The attacker fully controls both sides of the race by reading their own procfs entry while concurrently closing the BCM socket, so success does not depend on external timing or victim state.\nPR:L - can_create() imposes no capability check, the proc entry is mode 0644, and a CAN interface for TX_SETUP is obtainable via unprivileged user/net namespaces (vcan/vxcan with CAP_NET_ADMIN in the userns).\nUI:N - Exploitation is entirely self-contained; no other user needs to open a file, mount anything, or otherwise interact.\nS:U - Impact remains within the local kernel/OS authority\u2014a standard local privilege-escalation class UAF, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of bcm_op lets concurrent bcm_proc_show() read freed slab contents; demonstrated freelist-pointer and physmap leaks, and heap reclaim enables controlled disclosure of reclaimed object data.\nI:H - UAF of a linked bcm_op with attacker-controlled reclaim (e.g. sprayed list_head) yields corrupted kernel list traversal and write-capable primitives typical of slab UAFs, supporting integrity compromise and control-flow hijacking.\nA:H - UAF read of freed bcm_op causes kernel oops/GPF on bad pointers and can induce infinite list walks after reclaim, resulting in hard DoS."
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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.

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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Action not permitted

RHSA-2025:3095

CVE-2023-52922 (GCVE-0-2023-52922)

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Sightings

Nomenclature

Related by attack behaviour