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.
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.
Vendor
Product
CWE
Yayın Tarihi
2025-08-19 17:15:35
Güncelleme
2026-01-09 13:57:09
Source Identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
KEV Date Added
-
Kategoriler
Referanslar
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