CVE-2024-40951

Local crash via unset OCFS2 buffer association

Published Jul 12, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux kernel 6.6 before 6.6.36, 6.7 through 6.9.6, and 6.10-rc1 through 6.10-rc4 allows local users to crash systems. OCFS2 leaves bh->b_assoc_map unset, so ocfs2_abort_trigger() follows b_assoc_map->host->i_sb and dereferences a NULL pointer. Triggering the fault requires local access to an OCFS2 filesystem and journal error handling; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.24%
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 Linux kernel 6.6 before 6.6.36, 6.7 through 6.9.6, and 6.10-rc1 through 6.10-rc4 allows local users to crash systems. OCFS2 leaves bh->b_assoc_map unset, so ocfs2_abort_trigger() follows b_assoc_map->host->i_sb and dereferences a NULL pointer. Triggering the fault requires local access to an OCFS2 filesystem and journal error handling; the bounded consequence is a kernel crash.

The record

CVE
CVE-2024-40951
Published
Jul 12, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE 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=6.6
  2. Affected versionversion=8887b94d93224e0ef7e1bc6369640e313b8b12f4 <67bcecd780609f471260a8c83fb0ae15f27734ce
  3. Affected versionversion=8887b94d93224e0ef7e1bc6369640e313b8b12f4 <685d03c3795378fca6a1b3d43581f7f1a3fc095f
  4. Affected versionversion=8887b94d93224e0ef7e1bc6369640e313b8b12f4 <eb63357ef229fae061ce7ce2839d558681c42f1a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=8887b94d93224e0ef7e1bc6369640e313b8b12f4 <67bcecd780609f471260a8c83fb0ae15f27734ce; version=8887b94d93224e0ef7e1bc6369640e313b8b12f4 <685d03c3795378fca6a1b3d43581f7f1a3fc095f; version=8887b94d93224e0ef7e1bc6369640e313b8b12f4 <eb63357ef229fae061ce7ce2839d558681c42f1a

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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
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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