CVE-2023-52922

Kernel memory disclosure via stale BCM procfs entry

Published Nov 28, 2024 · Updated Aug 5, 2026

Use-after-free in the CAN BCM subsystem in affected Linux kernels allows local users to read freed memory through a procfs race. bcm_release() frees a bcm_op object before removing its procfs entry, so a concurrent bcm_proc_show() call dereferences the stale object. Local users must create a CAN BCM operation and race socket closure against reading its procfs entry, exposing reclaimed kernel data and risking a kernel crash.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the CAN BCM subsystem in affected Linux kernels allows local users to read freed memory through a procfs race. bcm_release() frees a bcm_op object before removing its procfs entry, so a concurrent bcm_proc_show() call dereferences the stale object. Local users must create a CAN BCM operation and race socket closure against reading its procfs entry, exposing reclaimed kernel data and risking a kernel crash.

The record

CVE
CVE-2023-52922
Published
Nov 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.25
  2. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <11b8e27ed448baa385d90154a141466bd5e92f18
  3. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <3c3941bb1eb53abe7d640ffee5c4d6b559829ab3
  4. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <55c3b96074f3f9b0aee19bf93cd71af7516582bb
  5. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6
  6. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <995f47d76647708ec26c6e388663ad4f3f264787
  7. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff
  8. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <cf254b4f68e480e73dab055014e002b77aed30ed
  9. Affected versionversion=ffd980f976e7fd666c2e61bf8ab35107efd11828 <dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <11b8e27ed448baa385d90154a141466bd5e92f18; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <3c3941bb1eb53abe7d640ffee5c4d6b559829ab3; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <55c3b96074f3f9b0aee19bf93cd71af7516582bb; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <995f47d76647708ec26c6e388663ad4f3f264787; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <cf254b4f68e480e73dab055014e002b77aed30ed; version=ffd980f976e7fd666c2e61bf8ab35107efd11828 <dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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