fs/ntfs3: prevent potential lcn remains uninitialized

{
  "id": "3dd8d5a1dfa580901835631f6d362323de053beeb194968dde9f9ea485771251",
  "url": "https://osv.dev/vulnerability/CVE-2026-72471",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs/ntfs3: prevent potential lcn remains uninitialized",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: prevent potential lcn remains uninitialized The target VCN being sought was not found within runs[0], causing run_lookup() to return false. This causes run_lookup_entry() to return false, which in turn results in a len value of 0, and the new parameter passed to attr_data_get_block() is NULL. Collectively, these factors ultimately cause attr_data_get_block_locked() to exit prematurely without initializing lcn, thereby triggering [1]. To prevent [1], the clen check within ni_seek_data_or_hole() has been moved to occur before the lcn check. [1] BUG: KMSAN: uninit-value in ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862 ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862 ntfs_llseek+0x22a/0x4a0 fs/ntfs3/file.c:1530 vfs_llseek fs/read_write.c:391 [inline]",
    "evidence": "osv:CVE-2026-72471",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-72471",
      "aliases": [
        "CVE-2026-72471"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c61326967728392931f8a2240cb2cf4c81b523c1"
                },
                {
                  "fixed": "7ae7e98b71438c494532492cbf58fc0d7f7988bb"
                },
                {
                  "fixed": "57ac2831c8e0f168090d38e3de758c6a59db44db"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72471.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.0.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72471.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.312400312Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/57ac2831c8e0f168090d38e3de758c6a59db44db",
        "https://git.kernel.org/stable/c/7ae7e98b71438c494532492cbf58fc0d7f7988bb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72471.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72471",
        "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/2026/72xxx/CVE-2026-72471.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72471",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499601,
  "published_at": "2026-08-15T05:57:13.117+00:00"
}