CVE-2025-38579
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.
- Score
- CVSS 3.1 7.8 High
- Status
- Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- Published
- 2025-08-19
- Last modified
- 2026-08-05
- Weaknesses
- CWE-908
Affected products
References
- https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800
- https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141
- https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa
- https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8
- https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0
- https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898
- https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
