f2fs: only redirty pinned folios in redirty_blocks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89841
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:50 UTC
Updated2026-09-16 11:16:50 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5951fee46befbf6176c86482432f4f76e522f16c 445e4a1e6025ecd5312e9a95c1b234192c976ca1 git Not specified
CNA Linux Linux affected 5951fee46befbf6176c86482432f4f76e522f16c 89c65ec3c18903de763cf567c96ab3ef60e5f3b0 git Not specified
CNA Linux Linux affected 5951fee46befbf6176c86482432f4f76e522f16c 85171332742e741ccd6f401c69b6e0d698119e72 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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