CVE-2026-89841
CVE CVE-2026-89841EUVD EUVD-2026-80441Published 2026-09-16T10:31:15.000ZLast changed 2026-09-16T14:39:12.000ZCVSS 7.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.18.51; 5951fee46befbf6176c86482432f4f76e522f16c <89c65ec3c18903de763cf567c96ab3ef60e5f3b0; patch: 7.3-rc1; patch: 7.2.5; 6.16; 5951fee46befbf6176c86482432f4f76e522f16c <445e4a1e6025ecd5312e9a95c1b234192c976ca1; 5951fee46befbf6176c86482432f4f76e522f16c <85171332742e741ccd6f401c69b6e0d698119e72; patch: 0
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.