CVE-2024-49877

Local kernel crash via unchecked OCFS2 buffer

Published Oct 21, 2024 · Updated May 23, 2026

NULL pointer dereference in affected Linux kernel OCFS2 releases allows local users to crash the system through filesystem cleanup. The cleanup path calls ocfs2_set_buffer_uptodate() with a NULL buffer head when OCFS2_BH_READAHEAD is absent, dereferencing bh. Exploitation requires local access to exercise an OCFS2 cleanup path; the demonstrated consequence is a kernel crash, not data access or code execution.

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 affected Linux kernel OCFS2 releases allows local users to crash the system through filesystem cleanup. The cleanup path calls ocfs2_set_buffer_uptodate() with a NULL buffer head when OCFS2_BH_READAHEAD is absent, dereferencing bh. Exploitation requires local access to exercise an OCFS2 cleanup path; the demonstrated consequence is a kernel crash, not data access or code execution.

The record

CVE
CVE-2024-49877
Published
Oct 21, 2024
Updated
May 23, 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 23, 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=01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56
  2. Affected versionversion=4.14.157 <4.15
  3. Affected versionversion=4.19.87 <4.19.323
  4. Affected versionversion=4.20
  5. Affected versionversion=4.4.204 <4.5
  6. Affected versionversion=4.9.204 <4.10
  7. Affected versionversion=65cbd1279f4b999d56a838344a30642db24cd215
  8. Affected versionversion=6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc <190d98bcd61117a78fe185222d162180f061a6ca
  9. Affected versionversion=97e1db17bc1ef4c2e1789bc9323c7be44fba53f8
  10. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <01cb2e751cc61ade454c9bc1aaa2eac1f8197112
  11. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <33b525cef4cff49e216e4133cc48452e11c0391e
  12. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <46b1edf0536a5291a8ad2337f88c926214b209d9
  13. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <4846e72ab5a0726e49ad4188b9d9df091ae78c64
  14. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <61b84013e560382cbe7dd56758be3154d43a3988
  15. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <d52c5652e7dcb7a0648bbb8642cc3e617070ab49
  16. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <df944dc46d06af65a75191183d52be017e6b9dbe
  17. Affected versionversion=cf76c78595ca87548ca5e45c862ac9e0949c4687 <e68c8323355e8cedfbe0bec7d5a39009f61640b6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56; version=4.14.157 <4.15; version=4.19.87 <4.19.323; version=4.20; version=4.4.204 <4.5; version=4.9.204 <4.10; version=65cbd1279f4b999d56a838344a30642db24cd215; version=6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc <190d98bcd61117a78fe185222d162180f061a6ca; version=97e1db17bc1ef4c2e1789bc9323c7be44fba53f8; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <01cb2e751cc61ade454c9bc1aaa2eac1f8197112; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <33b525cef4cff49e216e4133cc48452e11c0391e; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <46b1edf0536a5291a8ad2337f88c926214b209d9; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <4846e72ab5a0726e49ad4188b9d9df091ae78c64; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <61b84013e560382cbe7dd56758be3154d43a3988; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <d52c5652e7dcb7a0648bbb8642cc3e617070ab49; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <df944dc46d06af65a75191183d52be017e6b9dbe; version=cf76c78595ca87548ca5e45c862ac9e0949c4687 <e68c8323355e8cedfbe0bec7d5a39009f61640b6

Published CVSS scores

5.5NIST NVDCVSS: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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