CVE-2024-41020

Kernel memory corruption via stale POSIX lock

Published Jul 29, 2024 · Updated Aug 5, 2026

A race condition in affected Linux kernel releases on 32-bit systems allows local users to corrupt kernel memory through fcntl64 and close. The compat fcntl_setlk64 path retries a raced descriptor without detecting failed lock removal, leaving a stale POSIX lock that outlives freed owner and file objects. Exploitation requires low-privileged local access to a 32-bit kernel and can expose or modify kernel memory or crash the system.

CVSS severity7.8
High
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

A race condition in affected Linux kernel releases on 32-bit systems allows local users to corrupt kernel memory through fcntl64 and close. The compat fcntl_setlk64 path retries a raced descriptor without detecting failed lock removal, leaving a stale POSIX lock that outlives freed owner and file objects. Exploitation requires low-privileged local access to a 32-bit kernel and can expose or modify kernel memory or crash the system.

The record

CVE
CVE-2024-41020
Published
Jul 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.13
  2. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <4c43ad4ab41602201d34c66ac62130fe339d686f
  3. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <53e21cfa68a7d12de378b7116c75571f73e0dfa2
  4. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <5b0af8e4c70e4b884bb94ff5f0cd49ecf1273c02
  5. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <73ae349534ebc377328e7d21891e589626c6e82c
  6. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <911cc83e56a2de5a40758766c6a70d6998248860
  7. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <a561145f3ae973ebf3e0aee41624e92a6c5cb38d
  8. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <ed898f9ca3fa32c56c858b463ceb9d9936cc69c4
  9. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <f4d0775c6e2f1340ca0725f0337de149aaa989ca
  10. Affected versionversion=c293621bbf678a3d85e3ed721c3921c8a670610d <f8138f2ad2f745b9a1c696a05b749eabe44337ea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.13; version=c293621bbf678a3d85e3ed721c3921c8a670610d <4c43ad4ab41602201d34c66ac62130fe339d686f; version=c293621bbf678a3d85e3ed721c3921c8a670610d <53e21cfa68a7d12de378b7116c75571f73e0dfa2; version=c293621bbf678a3d85e3ed721c3921c8a670610d <5b0af8e4c70e4b884bb94ff5f0cd49ecf1273c02; version=c293621bbf678a3d85e3ed721c3921c8a670610d <73ae349534ebc377328e7d21891e589626c6e82c; version=c293621bbf678a3d85e3ed721c3921c8a670610d <911cc83e56a2de5a40758766c6a70d6998248860; version=c293621bbf678a3d85e3ed721c3921c8a670610d <a561145f3ae973ebf3e0aee41624e92a6c5cb38d; version=c293621bbf678a3d85e3ed721c3921c8a670610d <ed898f9ca3fa32c56c858b463ceb9d9936cc69c4; version=c293621bbf678a3d85e3ed721c3921c8a670610d <f4d0775c6e2f1340ca0725f0337de149aaa989ca; version=c293621bbf678a3d85e3ed721c3921c8a670610d <f8138f2ad2f745b9a1c696a05b749eabe44337ea

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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