CVE-2025-38164

Filesystem shutdown via stale F2FS segment summary

Published Jul 3, 2025 · Updated Aug 5, 2026

F2FS availability flaw in Linux 6.6.33 through 6.6.129 and 6.9 allows local users to stop a mounted filesystem. f2fs_gc_range migrates a block from an open current segment while its latest summary remains cached, leaving the SSA and SIT segment types inconsistent. A mounted zoned F2FS volume and the ability to create, pin, and extend a large file are required; the resulting critical error stops filesystem checkpointing.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

F2FS availability flaw in Linux 6.6.33 through 6.6.129 and 6.9 allows local users to stop a mounted filesystem. f2fs_gc_range migrates a block from an open current segment while its latest summary remains cached, leaving the SSA and SIT segment types inconsistent. A mounted zoned F2FS volume and the ability to create, pin, and extend a large file are required; the resulting critical error stops filesystem checkpointing.

The record

CVE
CVE-2025-38164
Published
Jul 3, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE 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

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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 <d1365d2abfaf2d85ee51a005da3ca373aea97f6a
  2. Affected versionversion=6.6.33 <6.6.130
  3. Affected versionversion=6.9
  4. Affected versionversion=9703d69d9d153bb230711d0d577454552aeb13d4 <44a51592ac657d8e422585414d7ec17a5b50fb0e
  5. Affected versionversion=9703d69d9d153bb230711d0d577454552aeb13d4 <773704c1ef96a8b70d0d186ab725f50548de82c4
  6. Affected versionversion=9703d69d9d153bb230711d0d577454552aeb13d4 <8d9431b0d11a5030aa1ce477defee455b3821701

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=40d76c393cca83938b11eb7ca8983aa3cd0ed69b <d1365d2abfaf2d85ee51a005da3ca373aea97f6a; version=6.6.33 <6.6.130; version=6.9; version=9703d69d9d153bb230711d0d577454552aeb13d4 <44a51592ac657d8e422585414d7ec17a5b50fb0e; version=9703d69d9d153bb230711d0d577454552aeb13d4 <773704c1ef96a8b70d0d186ab725f50548de82c4; version=9703d69d9d153bb230711d0d577454552aeb13d4 <8d9431b0d11a5030aa1ce477defee455b3821701

Published CVSS scores

5.5NVDCVSS: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 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

T1499.004Application or System Exploitation

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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