CVE-2024-49957

Kernel crash via failed OCFS2 journal load

Published Oct 21, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux OCFS2 allows local users to crash the kernel by mounting a volume with an undersized journal. When journal_reset() rejects the short journal, jbd2_journal_load() leaves j_sb_buffer NULL, but shutdown still passes it to lock_buffer(). Reaching the flaw requires local access and the ability to mount the crafted OCFS2 volume; the demonstrated consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.25%
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 OCFS2 allows local users to crash the kernel by mounting a volume with an undersized journal. When journal_reset() rejects the short journal, jbd2_journal_load() leaves j_sb_buffer NULL, but shutdown still passes it to lock_buffer(). Reaching the flaw requires local access and the ability to mount the crafted OCFS2 volume; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2024-49957
Published
Oct 21, 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. Oct 21, 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=2.6.32
  2. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <387bf565cc03e2e8c720b8b4798efea4aacb6962
  3. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <5784d9fcfd43bd853654bb80c87ef293b9e8e80a
  4. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <703b2c7e0798d263154dc8593dc2345f75dc077f
  5. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <82dfdd1e31e774578f76ce6dc90c834f96403a0f
  6. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b
  7. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <bf605ae98dab5c15c5b631d4d7f88898cb41b649
  8. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <f60e94a83db799bde625ac8671a5b4a6354e7120
  9. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <fd89d92c1140cee8f59de336cb37fa65e359c123
  10. Affected versionversion=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <ff55291fb36779819211b596da703389135f5b05

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.32; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <387bf565cc03e2e8c720b8b4798efea4aacb6962; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <5784d9fcfd43bd853654bb80c87ef293b9e8e80a; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <703b2c7e0798d263154dc8593dc2345f75dc077f; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <82dfdd1e31e774578f76ce6dc90c834f96403a0f; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <bf605ae98dab5c15c5b631d4d7f88898cb41b649; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <f60e94a83db799bde625ac8671a5b4a6354e7120; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <fd89d92c1140cee8f59de336cb37fa65e359c123; version=f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 <ff55291fb36779819211b596da703389135f5b05

Published CVSS scores

5.5NISTCVSS: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 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-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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