{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5951fee46befbf6176c86482432f4f76e522f16c"
            },
            {
              "fixed": "445e4a1e6025ecd5312e9a95c1b234192c976ca1"
            },
            {
              "fixed": "89c65ec3c18903de763cf567c96ab3ef60e5f3b0"
            },
            {
              "fixed": "85171332742e741ccd6f401c69b6e0d698119e72"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89841.json"
  },
  "details": "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.",
  "id": "CVE-2026-89841",
  "modified": "2026-09-18T03:30:26.012171121Z",
  "published": "2026-09-16T10:31:15.578Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89841.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89841"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "f2fs: only redirty pinned folios in redirty_blocks"
}