{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72200",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72200"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "ntfs: detect mapping-pairs LCN accumulator overflow",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: detect mapping-pairs LCN accumulator overflow\n\nThe NTFS mapping-pairs parser accumulates relative LCN deltas in a\nsigned integer.  A corrupted attribute can drive that addition past\nthe representable range.\n\nOne corrupt runlist shape sets the accumulated LCN to S64_MAX and\nthen adds a delta of 1 in the next mapping-pairs entry.\n\nSigned overflow is undefined and can turn an invalid runlist into a\ndifferent set of physical clusters.\n\nCheck the LCN addition for overflow before storing the next run.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/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-2026-72200"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7fb64788812d137b37f6d8724e1e41c624c1e814"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec4f061f2219e0f0c6465d56d0380bf749235a53"
    }
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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": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - Legacy NTFS is NFS-exportable (ntfs_export_ops) and commonly served via ksmbd; remote SMB/NFS reads on an exported NTFS mount reach ntfs_mapping_pairs_decompress() through VFS read/iomap and ntfs_map_runlist() without local shell access.\nAC:L - An attacker fully controls crafted on-disk mapping pairs offline (e.g., drive LCN to S64_MAX then add +1) and can reliably trigger decompression on mount or the next attribute access that maps the runlist; no races or victim-specific layout are required.\nPR:N - Triggering decompression needs only permission to cause server-side parsing of mounted NTFS metadata (e.g., guest/anonymous SMB or permissive NFS read, or unprivileged local open/read on an already-mounted volume), not init-namespace root or CAP_SYS_ADMIN at trigger time.\nUI:N - After the volume is mounted/exported, exploitation requires only normal remote or local filesystem read/open operations on files whose non-resident attributes carry the poisoned mapping pairs; no additional victim mount dialogs, USB insertion, or other user actions are needed during the attack.\nS:U - Impact stays within the kernel/host context (runlist corruption and misdirected block I/O on the mounted volume); it does not cross a VM, container, or IOMMU boundary to another security authority.\nC:H - Signed LCN accumulator overflow (undefined behavior) yields attacker-controlled cluster mappings, so subsequent reads can be directed to arbitrary on-volume clusters and disclose other files' data and metadata beyond the accessed object.\nI:H - Corrupted LCN values misdirect kernel writeback and allocation I/O to arbitrary physical clusters on the volume, enabling cross-file/metadata tampering and further corruption exploitable for broader integrity compromise.\nA:H - Misdirected cluster I/O and corrupt runlists cause mount/read/write failures, can destroy critical structures like $MFT, and repeated remote access can deny service to the host or exported filesystem."
    }
  }
}