CVE-2024-26871

Kernel crash via F2FS write-path race

Published Apr 17, 2024 · Updated May 11, 2026

A NULL pointer dereference in Linux F2FS allows local users to crash affected kernels during writes to zoned storage. A concurrent thread can submit and clear io->bio before f2fs_submit_page_write reaches a zone-end path that calls bio_get on the NULL pointer. Reachability requires an F2FS zone-end write and the concurrent submission race; the reported consequence is an availability-only kernel crash.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in Linux F2FS allows local users to crash affected kernels during writes to zoned storage. A concurrent thread can submit and clear io->bio before f2fs_submit_page_write reaches a zone-end path that calls bio_get on the NULL pointer. Reachability requires an F2FS zone-end write and the concurrent submission race; the reported consequence is an availability-only kernel crash.

The record

CVE
CVE-2024-26871
Published
Apr 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 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=6.5
  2. Affected versionversion=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <4c122a32582b67bdd44ca8d25f894ee2dc54f566
  3. Affected versionversion=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <6d102382a11d5e6035f6c98f6e508a38541f7af3
  4. Affected versionversion=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <8e2ea8b04cb8d976110c4568509e67d6a39b2889
  5. Affected versionversion=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <c2034ef6192a65a986a45c2aa2ed05824fdc0e9f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <4c122a32582b67bdd44ca8d25f894ee2dc54f566; version=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <6d102382a11d5e6035f6c98f6e508a38541f7af3; version=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <8e2ea8b04cb8d976110c4568509e67d6a39b2889; version=e067dc3c6b9c419bac43c6a0be2d85f44681f863 <c2034ef6192a65a986a45c2aa2ed05824fdc0e9f

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
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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