CVE-2025-38579
f2fs: fix KMSAN uninit-value in extent_info usage
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
5.15
References 7
git.kernel.org
- stable/c/08e8ab00a6d20d5544c932ee85a297d833895141
- stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269
- stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898
- stable/c/44a79437309e0ee2276ac17aaedc71253af253a8
- stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0
- stable/c/01b6f5955e0008af6bc3a181310d2744bb349800
- stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa