{"id":"CVE-2026-89841","published":"2026-09-16T11:16:50.937","lastModified":"2026-09-16T15:18:12.597","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: only redirty pinned folios in redirty_blocks\n\nredirty_blocks() pins folios with read_cache_folio() and then walks the\nsame range again with filemap_lock_folio() to redirty them and drop the\nreferences it took.\n\nCommit 5951fee46bef (\"f2fs: Use a folio in redirty_blocks()\") changed\nthe second pass to a do/while loop. If read_cache_folio() fails before\nanything is pinned, page_idx does not advance but the cleanup loop still\nruns once.\n\nIf readahead has already populated the failed folio in page cache, that\nextra iteration finds it and folio_put_refs(folio, 2) drops one\nreference too many. Later drop_caches or reclaim can then report\n\"BUG: Bad page state\".\n\nOnly redirty the range that was pinned successfully.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1","tags":[]},{"url":"https://git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72","tags":[]},{"url":"https://git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}