Answer in brief
CVE-2025-38579 records a Unknown severity 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.
Answer in brief
CVE-2025-38579 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
A CVSS score is not reported in the current record. 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.