CVE-2025-40150

Filesystem shutdown via F2FS garbage-collection race

Published Nov 12, 2025 · Updated May 23, 2026

Race condition in F2FS in affected Linux kernel versions allows local users to force a filesystem shutdown via concurrent file operations. During pinned-file fallocate, do_garbage_collect can migrate a segment newly allocated by another log while reading its stale type from the on-disk SSA instead of the updated in-memory SIT. The condition requires write access to a mounted F2FS volume and overlapping fallocate and block-allocation activity; the documented result is filesystem shutdown.

CVSS severityUnavailable
Unscored
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

Race condition in F2FS in affected Linux kernel versions allows local users to force a filesystem shutdown via concurrent file operations. During pinned-file fallocate, do_garbage_collect can migrate a segment newly allocated by another log while reading its stale type from the on-disk SSA instead of the updated in-memory SIT. The condition requires write access to a mounted F2FS volume and overlapping fallocate and block-allocation activity; the documented result is filesystem shutdown.

The record

CVE
CVE-2025-40150
Published
Nov 12, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 12, 2025CVE 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=40d76c393cca83938b11eb7ca8983aa3cd0ed69b <db489778e6f2a4034c2cd26fadda2796eba24dcd
  2. Affected versionversion=6.6.33 <6.6.130
  3. Affected versionversion=6.9
  4. Affected versionversion=9703d69d9d153bb230711d0d577454552aeb13d4 <25d2dc669f2a7e48b335d1cb07139f2ffc9fe5df
  5. Affected versionversion=9703d69d9d153bb230711d0d577454552aeb13d4 <d625a2b08c089397d3a03bff13fa8645e4ec7a01
  6. Affected versionversion=9703d69d9d153bb230711d0d577454552aeb13d4 <eec1589be36fcf7440755703e4faeee2c01e360b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=40d76c393cca83938b11eb7ca8983aa3cd0ed69b <db489778e6f2a4034c2cd26fadda2796eba24dcd; version=6.6.33 <6.6.130; version=6.9; version=9703d69d9d153bb230711d0d577454552aeb13d4 <25d2dc669f2a7e48b335d1cb07139f2ffc9fe5df; version=9703d69d9d153bb230711d0d577454552aeb13d4 <d625a2b08c089397d3a03bff13fa8645e4ec7a01; version=9703d69d9d153bb230711d0d577454552aeb13d4 <eec1589be36fcf7440755703e4faeee2c01e360b

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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