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🛡️ CVE-2025-38579 — debian-linux

🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-908 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

f2fs: fix KMSAN uninit-value in extent_info usage

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix KMSAN uninit-value in extent_info usage

KMSAN reported a use of uninitialized value in __is_extent_mergeable()

and __is_back_mergeable() via the read extent tree path.

The root cause is that get_read_extent_info() only initializes three

fields (fofs, blk, len) of struct extent_info, leaving the

remaining fields uninitialized. This leads to undefined behavior

when those fields are accessed later, especially during

extent merging.

Fix it by zero-initializing the extent_info struct before population.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2025-38579 is classified as CWE-908: Use of Uninitialized Resource. A resource is read before being initialised, so its contents are whatever was left there.

Affected software

CVE-2025-38579 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.16.0 up to 6.16.1)
  • linux-kernel (from 6.16 up to 6.16.1)

Timeline and source

Published on 19 August 2025 and last revised on 30 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org

CVE-2025-38579 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-908
Public Exploit ✅ No
Source NVD
Published 2025-08-19
Updated 2026-08-20
Modified 2026-07-30

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.16.0 6.16.1
linux-kernel 6.16 6.16.1

Similar Threats

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