CVE-2025-23131

Local kernel crash via NULL lockspace dereference

Published Apr 16, 2025 · Updated Jul 4, 2026

NULL pointer dereference in the DLM subsystem in Linux 2.6.31 through 6.14.1 allows local users to crash the kernel via event_done. The lockspace creation path treats a positive do_uevent return as success after clearing the lockspace pointer, and device_create_lockspace passes that NULL pointer to dlm_find_lockspace_local. A local user able to write a positive value to the DLM event_done attribute can trigger the crash; confidentiality and integrity are unaffected.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the DLM subsystem in Linux 2.6.31 through 6.14.1 allows local users to crash the kernel via event_done. The lockspace creation path treats a positive do_uevent return as success after clearing the lockspace pointer, and device_create_lockspace passes that NULL pointer to dlm_find_lockspace_local. A local user able to write a positive value to the DLM event_done attribute can trigger the crash; confidentiality and integrity are unaffected.

The record

CVE
CVE-2025-23131
Published
Apr 16, 2025
Updated
Jul 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 4, 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=2.6.31
  2. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <10b7a59814765d18d43555c9cef4eb3048b7e8a3
  3. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <7109d69bec6edce546dc870e66bd2b668a3d5549
  4. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <8e2bad543eca5c25cd02cbc63d72557934d45f13
  5. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <a1c41aebb184d9228a440dcb6761224e65b0e49a
  6. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c
  7. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <c7837e2c96559663c33f43da403d9cf3cf77cfa7
  8. Affected versionversion=8511a2728ab82cab398e39d019f5cf1246021c1c <ee28d99d789b077565cbe0377374d1e826c64d93

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=8511a2728ab82cab398e39d019f5cf1246021c1c <10b7a59814765d18d43555c9cef4eb3048b7e8a3; version=8511a2728ab82cab398e39d019f5cf1246021c1c <7109d69bec6edce546dc870e66bd2b668a3d5549; version=8511a2728ab82cab398e39d019f5cf1246021c1c <8e2bad543eca5c25cd02cbc63d72557934d45f13; version=8511a2728ab82cab398e39d019f5cf1246021c1c <a1c41aebb184d9228a440dcb6761224e65b0e49a; version=8511a2728ab82cab398e39d019f5cf1246021c1c <b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c; version=8511a2728ab82cab398e39d019f5cf1246021c1c <c7837e2c96559663c33f43da403d9cf3cf77cfa7; version=8511a2728ab82cab398e39d019f5cf1246021c1c <ee28d99d789b077565cbe0377374d1e826c64d93

Published CVSS scores

5.5NVDCVSS: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

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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
T1499Endpoint Denial of Service

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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