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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
94afd6d6e5253179c9b891d02081cc8355a11768 to < 08e8ab00a6d20d5544c932ee85a297d833895141affected94afd6d6e5253179c9b891d02081cc8355a11768 to < e68b751ec2b15d866967812c57cfdfc1eba6a269affected94afd6d6e5253179c9b891d02081cc8355a11768 to < dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898affected94afd6d6e5253179c9b891d02081cc8355a11768 to < 44a79437309e0ee2276ac17aaedc71253af253a8affected94afd6d6e5253179c9b891d02081cc8355a11768 to < cc1615d5aba4f396cf412579928539a2b124c8a0affected94afd6d6e5253179c9b891d02081cc8355a11768 to < 01b6f5955e0008af6bc3a181310d2744bb349800affected94afd6d6e5253179c9b891d02081cc8355a11768 to < 154467f4ad033473e5c903a03e7b9bca7df9a0faaffected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.190 to ≤ 5.15.*unaffected6.1.148 to ≤ 6.1.*unaffected6.6.102 to ≤ 6.6.*unaffected6.12.42 to ≤ 6.12.*unaffected6.15.10 to ≤ 6.15.*unaffected6.16.1 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141 ↗
- https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269 ↗
- https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898 ↗
- https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8 ↗
- https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0 ↗
- https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800 ↗
- https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗