ntfs: bound the free-cluster bitmap scan to the volume

{
  "id": "85297a5a5f884e320b34163cca4cdab1ee028b88c39db9be9249058a23c3530b",
  "url": "https://osv.dev/vulnerability/CVE-2026-89614",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ntfs: bound the free-cluster bitmap scan to the volume",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ntfs: bound the free-cluster bitmap scan to the volume vol->lcn_empty_bits_per_page is sized from vol->nr_clusters at mount, but ntfs_cluster_alloc() bounds its scan of that array by the size of $Bitmap. Those are independent on-disk quantities and the mount-time check only rejects a $Bitmap that is too small, so an image whose $Bitmap covers more clusters than the volume has lets the scan index past the array. A run whose LCN lies in that gap takes the allocator straight there, since the caller passes the file's own last LCN as its locality hint. KASAN reports a slab out-of-bounds read when a file on such a volume is extended. Clamp the scan to what that array covers, mirroring the max_index calculation the mount-time scan already uses, and reject a decoded LCN at or beyond nr_clusters in the mapping pairs decoder. Conforming volumes are unaffected.",
    "evidence": "osv:CVE-2026-89614",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-89614",
      "aliases": [
        "CVE-2026-89614"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "11ccc9107dc460de28af90fac1f42404d9802735"
                },
                {
                  "fixed": "dc15a9f5307d5372aef3b64bf3ed7802f530c471"
                },
                {
                  "fixed": "19cac7902a8ab748e15f98ddaafcf5f8882be21d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89614.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.1.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89614.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.304741293Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/19cac7902a8ab748e15f98ddaafcf5f8882be21d",
        "https://git.kernel.org/stable/c/dc15a9f5307d5372aef3b64bf3ed7802f530c471",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89614.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89614",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89614.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89614",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492089,
  "published_at": "2026-09-11T19:45:14.747+00:00"
}