ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock()

{
  "id": "2a72ff6d8c43c6f216107908851c91841788ae43f0663a2f7e88c1d56e50bfcf",
  "url": "https://osv.dev/vulnerability/CVE-2026-72185",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock() When ntfs_map_runlist_nolock() needs to look up the attribute extent containing a target VCN (ctx_needs_reset == true), it calls ntfs_attr_lookup() and then expects the result to be a non-resident attribute, since only non-resident attributes have a mapping pairs array to decompress. A crafted NTFS image can place a resident attribute where a non-resident one is expected, causing ntfs_attr_lookup() to succeed but return a resident attribute record. Previously this was caught only by a WARN_ON(), which does not stop execution. The code then falls through to read a->data.non_resident.highest_vcn from what is actually a resident attribute, accessing the wrong union member and corrupting the VCN range check. The caller path triggering this warning during mount is: ntfs_map_runlist_nolock ntfs_empty_logfile load_system_files ntfs_fill_super In this path ctx is NULL, so ntfs_map_runlist_nolock() allocates a temporary search context internally and sets ctx_needs_reset = true. The existing resident-attribute guard in the ctx != NULL branch already returns -EIO silently for the same condition; make the ctx_needs_reset path consistent by replacing the WARN_ON() with the same -EIO error return. This causes the crafted image to be rejected with a mount error instead of triggering a kernel warning.",
    "evidence": "osv:CVE-2026-72185",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-72185",
      "aliases": [
        "CVE-2026-72185"
      ],
      "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": "495e90fa334828d4119061e2726af51d0a0fb4ed"
                },
                {
                  "fixed": "b397b1238a217264bb02f963a1a1eadf71906375"
                },
                {
                  "fixed": "b8d6c528e9d57d263fee1a648409f84a68b2561d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72185.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.1.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72185.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.328343497Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b397b1238a217264bb02f963a1a1eadf71906375",
        "https://git.kernel.org/stable/c/b8d6c528e9d57d263fee1a648409f84a68b2561d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72185.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72185",
        "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-2026-72185.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72185",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505834,
  "published_at": "2026-08-15T05:53:47.388+00:00"
}