Answer in brief
CVE-2025-38579 records a High severity (CVSS 7.8) vulnerability in f2fs: fix KMSAN uninit-value in extent_info usage. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=94afd6d6e5253179c9b891d02081cc8355a11768 <08e8ab00a6d20d5544c932ee85a297d833895141 || >=94afd6d6e5253179c9b891d02081cc8355a11768 <e68b751ec2b15d866967812c57cfdfc1eba6a269 || >=94afd6d6e5253179c9b891d02081cc8355a11768 <dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898 || >=94afd6d6e5253179c9b891d02081cc8355a11768 <44a79437309e0ee2276ac17aaedc71253af253a8 || >=94afd6d6e5253179c9b891d02081cc8355a11768 <cc1615d5aba4f396cf412579928539a2b124c8a0 || >=94afd6d6e5253179c9b891d02081cc8355a11768 <01b6f5955e0008af6bc3a181310d2744bb349800 || >=94afd6d6e5253179c9b891d02081cc8355a11768 <154467f4ad033473e5c903a03e7b9bca7df9a0fa | 08e8ab00a6d20d5544c932ee85a297d833895141, e68b751ec2b15d866967812c57cfdfc1eba6a269, dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898, 44a79437309e0ee2276ac17aaedc71253af253a8, cc1615d5aba4f396cf412579928539a2b124c8a0, 01b6f5955e0008af6bc3a181310d2744bb349800, 154467f4ad033473e5c903a03e7b9bca7df9a0fa |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Aug 19, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.