High 7.8Published Sep 16, 2026

CVE-2026-89841f2fs: only redirty pinned folios in redirty_blocks

Updated under an hour ago (2026-10-19 06:20 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Sep 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	5951fee46befbf6176c86482432f4f76e522f16c builds before 445e4a1e6025ecd5312e9a95c1b234192c976ca1; 5951fee46befbf6176c86482432f4f76e522f16c builds before 89c65ec3c18903de763cf567c96ab3ef60e5f3b0; from 5951fee46befbf6176c86482432f4f76e522f16c before 85171332742e741ccd6f401c69b6e0d698119e72	CNA record

References

https://git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1
https://git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0
https://git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.