Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2025-38579

7.8 · HIGH

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…

Published Aug 19, 2025CWE-908EPSS 0.17%

Overview

CVE-2025-38579 is a high-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800Refgit.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141Refgit.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0faRefgit.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8Refgit.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0Refgit.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898Refgit.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269Reflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38579?

CVE-2025-38579 is a high-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38579?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38579?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38579?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38579 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2025

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999