CVE-2023-52939

Local system crash via null memcg dereference

Published Mar 27, 2025 · Updated May 11, 2026

NULL dereference in Linux kernel 5.4 through 6.1.10 and 6.2-rc1 through 6.2-rc6 allows local users to crash the system. Forced uncharging of a hardware-poisoned LRU page can leave folio_memcg null, but mem_cgroup_track_foreign_dirty_slowpath dereferences it while recording foreign writeback. Reachability requires that poisoned, uncharged page state; the documented consequence is a kernel crash with no confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL dereference in Linux kernel 5.4 through 6.1.10 and 6.2-rc1 through 6.2-rc6 allows local users to crash the system. Forced uncharging of a hardware-poisoned LRU page can leave folio_memcg null, but mem_cgroup_track_foreign_dirty_slowpath dereferences it while recording foreign writeback. Reachability requires that poisoned, uncharged page state; the documented consequence is a kernel crash with no confidentiality or integrity impact.

The record

CVE
CVE-2023-52939
Published
Mar 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.4
  2. Affected versionversion=97b27821b4854ca744946dae32a3f2fd55bcd5bc <ac86f547ca1002aec2ef66b9e64d03f45bbbfbb9
  3. Affected versionversion=97b27821b4854ca744946dae32a3f2fd55bcd5bc <b79ba5953f6fdc5559389ad415620bffc24f024b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=97b27821b4854ca744946dae32a3f2fd55bcd5bc <ac86f547ca1002aec2ef66b9e64d03f45bbbfbb9; version=97b27821b4854ca744946dae32a3f2fd55bcd5bc <b79ba5953f6fdc5559389ad415620bffc24f024b

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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