Answer in brief
CVE-2026-89841 records a High severity (CVSS 7.8) vulnerability in f2fs: only redirty pinned folios in redirty_blocks. 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 | >=5951fee46befbf6176c86482432f4f76e522f16c <445e4a1e6025ecd5312e9a95c1b234192c976ca1 || >=5951fee46befbf6176c86482432f4f76e522f16c <89c65ec3c18903de763cf567c96ab3ef60e5f3b0 || >=5951fee46befbf6176c86482432f4f76e522f16c <85171332742e741ccd6f401c69b6e0d698119e72 | 445e4a1e6025ecd5312e9a95c1b234192c976ca1, 89c65ec3c18903de763cf567c96ab3ef60e5f3b0, 85171332742e741ccd6f401c69b6e0d698119e72 |
| Linux/Linuxgeneric | 6.16 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
In the Linux kernel, the following vulnerability has been resolved: f2fs: only redirty pinned folios in redirty_blocks redirty_blocks() pins folios with read_cache_folio() and then walks the same range again with filemap_lock_folio() to redirty them and drop the references it took. Commit 5951fee46bef ("f2fs: Use a folio in redirty_blocks()") changed the second pass to a do/while loop. If read_cache_folio() fails before anything is pinned, page_idx does not advance but the cleanup loop still runs once. If readahead has already populated the failed folio in page cache, that extra iteration finds it and folio_put_refs(folio, 2) drops one reference too many. Later drop_caches or reclaim can then report "BUG: Bad page state". Only redirty the range that was pinned successfully.
Quoted source text, attributed separately from HOL analysis.