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CVE-2026-72198 (GCVE-0-2026-72198)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-19 07:37
VLAI
Title
ntfs: reject non-resident records for resident-only attributes
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: reject non-resident records for resident-only attributes The shared lookup-time attribute validator rejects non-resident $FILE_NAME and $VOLUME_NAME records because their formats require resident values and callers handle returned records as resident attributes. Other resident-only attribute types still pass through the generic non-resident mapping-pairs checks. That leaves real resident/non-resident union confusion paths. Inode load looks up $STANDARD_INFORMATION and then reads data.resident.value_offset without checking a->non_resident. ntfs_inode_sync_standard_information() does the same when updating the standard information value. ntfs_write_volume_flags() also looks up $VOLUME_INFORMATION and reads data.resident.value_offset directly. $INDEX_ROOT callers in dir.c and index.c depend on the same lookup contract before consuming the resident index root value. Reject non-resident records for all resident-only attribute types in the shared validator. Keep the existing $FILE_NAME and $VOLUME_NAME behavior, but factor it through a helper and extend it to $STANDARD_INFORMATION, $OBJECT_ID, $VOLUME_INFORMATION, $INDEX_ROOT, and $EA_INFORMATION. For $OBJECT_ID and $EA_INFORMATION this is contract hardening for resident-only formats; this patch only rejects the non-resident form and does not add new resident value validation for those types.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89 (git)
Affected: 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 , < b54c9beb90e570bae17a9c18442aeeaf17165ccb (git)
Affected: 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 , < 097cdfd0a55df5af82c9753833f39a8bfadbcfcb (git)
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Linux Linux Affected: 2.6.12
Affected: 7.1
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.9 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/attrib.c"
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              "version": "0",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject non-resident records for resident-only attributes\n\nThe shared lookup-time attribute validator rejects non-resident\n$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-\u003enon_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."
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "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."
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        "shortName": "Linux"
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    "cveId": "CVE-2026-72198",
    "datePublished": "2026-08-15T05:53:56.782Z",
    "dateReserved": "2026-08-09T03:40:39.911Z",
    "dateUpdated": "2026-08-19T07:37:22.543Z",
    "state": "PUBLISHED"
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      "percentile": "0.0567"
    },
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      "cve": "CVE-2026-72198",
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      "product_status:known_affected": "1",
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      "status": "final",
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      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-72198.json",
      "version": "1"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T07:06:18+00:00",
      "cve": "CVE-2026-72198",
      "id": "CVE-2026-72198",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs: reject non-resident records for resident-only attributes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72198.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-21T00:42:42Z",
      "cve": "CVE-2026-72198",
      "id": "CVE-2026-72198",
      "initial_release_date": "2026-08-21T00:42:42Z",
      "product_status:known_affected": "255",
      "product_status:known_not_affected": "29",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72198",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72198.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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