CVE-2025-38579

Vulnerability overview

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.

Affected product and versions

Product

Linux Linux, linux kernel, debian linux

Affected versions

>= 94afd6d6e5253179c9b891d02081cc8355a11768 < 08e8ab00a6d20d5544c932ee85a297d833895141, >= 94afd6d6e5253179c9b891d02081cc8355a11768 < e68b751ec2b15d866967812c57cfdfc1eba6a269, >= 94afd6d6e5253179c9b891d02081cc8355a11768 < dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898, >= 94afd6d6e5253179c9b891d02081cc8355a11768 < 44a79437309e0ee2276ac17aaedc71253af253a8, >= 94afd6d6e5253179c9b891d02081cc8355a11768 < cc1615d5aba4f396cf412579928539a2b124c8a0, >= 94afd6d6e5253179c9b891d02081cc8355a11768 < 01b6f5955e0008af6bc3a181310d2744bb349800, >= 94afd6d6e5253179c9b891d02081cc8355a11768 < 154467f4ad033473e5c903a03e7b9bca7df9a0fa, >= 5.15, >= 5.15 < 5.15.190, >= 5.16 < 6.1.148, >= 6.2 < 6.6.102, >= 6.7 < 6.12.42, >= 6.13 < 6.15.10, >= 6.16 < 6.16.1, 11.0

Fixed versions

5.15.190, 6.1.148, 6.6.102, 6.12.42, 6.15.10, 6.16.1

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-908