Riskcovery

CVE-2026-89841

f2fs: only redirty pinned folios in redirty_blocks

State
Published
Severity
7.8 High
Published
Sep 16, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 5951fee46befbf6176c86482432f4f76e522f16c to before 445e4a1e6025ecd5312e9a95c1b234192c976ca1Affected
  • 5951fee46befbf6176c86482432f4f76e522f16c to before 89c65ec3c18903de763cf567c96ab3ef60e5f3b0Affected
  • 5951fee46befbf6176c86482432f4f76e522f16c to before 85171332742e741ccd6f401c69b6e0d698119e72Affected
LinuxLinux
  • 6.16Affected
  • before 6.16Not affected
  • 6.18.51 through 6.18.*Not affected
  • 7.2.5 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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