{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72198",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72198"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "ntfs: reject non-resident records for resident-only attributes",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject non-resident records for resident-only attributes\n\nThe shared lookup-time attribute validator rejects non-resident\n$FILE_NAME and $VOLUME_NAME records because their formats require\nresident values and callers handle returned records as resident\nattributes. Other resident-only attribute types still pass through the\ngeneric non-resident mapping-pairs checks.\n\nThat leaves real resident/non-resident union confusion paths. Inode load\nlooks up $STANDARD_INFORMATION and then reads data.resident.value_offset\nwithout checking a->non_resident. ntfs_inode_sync_standard_information()\ndoes the same when updating the standard information value.\nntfs_write_volume_flags() also looks up $VOLUME_INFORMATION and reads\ndata.resident.value_offset directly. $INDEX_ROOT callers in dir.c and\nindex.c depend on the same lookup contract before consuming the resident\nindex root value.\n\nReject non-resident records for all resident-only attribute types in the\nshared validator. Keep the existing $FILE_NAME and $VOLUME_NAME behavior,\nbut factor it through a helper and extend it to\n$STANDARD_INFORMATION, $OBJECT_ID, $VOLUME_INFORMATION, $INDEX_ROOT, and\n$EA_INFORMATION. For $OBJECT_ID and $EA_INFORMATION this is contract\nhardening for resident-only formats; this patch only rejects the\nnon-resident form and does not add new resident value validation for\nthose types.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72198"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b54c9beb90e570bae17a9c18442aeeaf17165ccb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/097cdfd0a55df5af82c9753833f39a8bfadbcfcb"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T07:38:23Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in the in-kernel NTFS filesystem driver parsing on-disk MFT attribute records from a block device; exploitation requires mounting or accessing a crafted NTFS image via local syscalls (mount/fsopen), not remote network packet handling.\nAC:L - An attacker fully controls crafted NTFS metadata and can reliably mark resident-only attributes (e.g. $STANDARD_INFORMATION) as non-resident with attacker-chosen union fields that pass generic non-resident validation, deterministically triggering resident/non-resident type confusion.\nPR:L - Reaching the vulnerable ntfs_attr_lookup/ntfs_read_locked_inode paths requires mounting the filesystem (CAP_SYS_ADMIN), which unprivileged attackers can obtain in a user+mount namespace on typical Linux configurations without real init-namespace root.\nUI:N - No victim interaction is required when the attacker mounts their own malicious NTFS image (e.g. loop device) inside a user namespace; inode load and writeback then parse the poisoned attributes automatically during normal filesystem operations.\nS:U - Exploitation corrupts kernel memory and can yield local privilege escalation within the same kernel/host security boundary; it does not inherently cross VM, container, or IOMMU isolation boundaries on its own.\nC:H - Callers such as ntfs_read_locked_inode() dereference data.resident.value_offset on attributes validated as non-resident, interpreting non-resident union bytes as a resident offset and performing out-of-bounds reads of MFT/kernel memory controllable by the attacker.\nI:H - Write paths including ntfs_inode_sync_standard_information() and ntfs_write_volume_flags() use the same misinterpreted resident offset to write standard-information and volume-information fields, giving attacker-influenced out-of-bounds kernel memory writes and type-confusion primitives.\nA:H - Malformed resident/non-resident metadata can cause kernel oops/panics during inode load, directory traversal, or inode sync on mount and routine file activity, and memory corruption can crash or hang the system even before full exploitation."
    }
  }
}