CVE-2025-38579
f2fs: fix KMSAN uninit-value in extent_info usage
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 19, 2025 |
| Last Updated | May 11, 2026 |
Stay Ahead of the Next One
Get instant alerts for linux linux
Be the first to know when new unknown vulnerabilities affecting linux linux are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
Linux / Linux
94afd6d6e5253179c9b891d02081cc8355a11768 < 08e8ab00a6d20d5544c932ee85a297d833895141 94afd6d6e5253179c9b891d02081cc8355a11768 < e68b751ec2b15d866967812c57cfdfc1eba6a269 94afd6d6e5253179c9b891d02081cc8355a11768 < dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898 94afd6d6e5253179c9b891d02081cc8355a11768 < 44a79437309e0ee2276ac17aaedc71253af253a8 94afd6d6e5253179c9b891d02081cc8355a11768 < cc1615d5aba4f396cf412579928539a2b124c8a0 94afd6d6e5253179c9b891d02081cc8355a11768 < 01b6f5955e0008af6bc3a181310d2744bb349800 94afd6d6e5253179c9b891d02081cc8355a11768 < 154467f4ad033473e5c903a03e7b9bca7df9a0fa
Linux / Linux
5.15
References
git.kernel.org: https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141 git.kernel.org: https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269 git.kernel.org: https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898 git.kernel.org: https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8 git.kernel.org: https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0 git.kernel.org: https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800 git.kernel.org: https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html