CVE-2026-89841
- Source
- https://cve.org/CVERecord?id=CVE-2026-89841
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89841.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-89841
- Downstream
- Published
- 2026-09-16T10:31:15Z
- Modified
- 2026-09-18T03:48:33Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- f2fs: only redirty pinned folios in redirty_blocks
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89841.json" }- References
-
- https://git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1
- https://git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72
- https://git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89841.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-89841
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git