ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head

{
  "id": "ba0c1aef871ed13899a6cd99a216b9a08cc6f47d0e1efaf34ed784eb0b1ce87c",
  "url": "https://osv.dev/vulnerability/CVE-2026-72192",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head indx_insert_into_root() promotes a full resident $INDEX_ROOT into $INDEX_ALLOCATION and copies all non-last resident root entries into a newly allocated INDEX_BUFFER via hdr_insert_head(). The source byte count 'to_move' is summed from the on-disk resident entry sizes and is independent of the destination buffer size, which comes from root->index_block_size (via indx->index_bits). A crafted NTFS image that keeps a valid, full resident root but shrinks root->index_block_size down to 512 after the root has been populated makes hdr_insert_head() memcpy attacker-controlled resident entry bytes past the end of the kmalloc(1u << indx->index_bits) allocation returned by indx_new(). For a 512-byte destination and a resident root whose non-last entries total 560 bytes, the memcpy overruns by 120 bytes and a following memmove extends the highest written offset to 136 bytes past the allocation. The overflow bytes are a direct copy of on-disk entries (via kmemdup), so they are fully attacker-controlled. The write is reachable from unprivileged open(O_CREAT) on a mounted crafted NTFS image: a single sufficiently long create in a directory whose resident root is already full forces root promotion and triggers the copy. This is a controlled out-of-bounds write of 120-136 bytes past a kmalloc(index_block_size) allocation, with attacker-controlled content. I",
    "evidence": "osv:CVE-2026-72192",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.212",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.178",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.6.145",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.97",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-72192",
      "aliases": [
        "CVE-2026-72192"
      ],
      "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": [
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              "type": "GIT",
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                {
                  "fixed": "cb3161deebcaf8d36d3115abf452c633f2180fc1"
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                  "fixed": "53c5f3b2da3774b41534728aba295c098c9efa19"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72192.json"
          }
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
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                {
                  "fixed": "5.15.212"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72192.json"
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      ],
      "modified": "2026-10-28T02:30:40.252070150Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0af83b8155cc848e9f5d2c36e20a70d024214649",
        "https://git.kernel.org/stable/c/194b00c99ba971fa7cf6acd747a36032c6de54eb",
        "https://git.kernel.org/stable/c/53c5f3b2da3774b41534728aba295c098c9efa19",
        "https://git.kernel.org/stable/c/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67",
        "https://git.kernel.org/stable/c/aaa1f956c0fc41089a4a534da7df91552a08a47c",
        "https://git.kernel.org/stable/c/cb3161deebcaf8d36d3115abf452c633f2180fc1",
        "https://git.kernel.org/stable/c/d240f5f9d036b8180224954d9873f172b6be4dd8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72192.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72192",
        "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-2026-72192.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72192",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507832,
  "published_at": "2026-08-15T05:53:52.634+00:00"
}