{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/attrib.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "44885c9b45eb4082fb7f558590d84bb254a08e94",
              "status": "affected",
              "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
              "versionType": "git"
            },
            {
              "lessThan": "344b18f389f9934d59c7b0cf3d20541ea2e0da58",
              "status": "affected",
              "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/attrib.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()\n\nWhen resolving an attribute lookup with a non-zero @lowest_vcn,\nntfs_external_attr_find() peeks at the next $ATTRIBUTE_LIST entry to\ndecide whether to keep searching, but bounds that not-yet-validated\nentry only with \"(u8 *)next_al_entry + 6 \u003c al_end\" (which proves just\nbytes 0..6 are in range) and \"(u8 *)next_al_entry + length \u003c= al_end\"\nwith an attacker-controlled, non-8-aligned length. It then reads\nnext_al_entry-\u003elowest_vcn (an __le64 at offset 8) and the name at\nnext_al_entry-\u003ename_offset, both of which can lie past al_end -- the\nexact end of the kvmalloc\u0027d attribute-list buffer (allocated at the\non-disk attr_list_size, no rounding). A crafted on-disk $ATTRIBUTE_LIST\nwhose last entry sits a few bytes before al_end therefore yields a slab\nout-of-bounds read when the inode is read.\n\nValidate the look-ahead entry with ntfs_attr_list_entry_is_valid() (added\nin patch 1/3) before dereferencing lowest_vcn and the name, so the same\nfixed-header, length and name bounds the main attribute-list walk uses now\nguard this read too."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Classic NTFS registers ntfs_export_ops; remote nfsd/ksmbd VFS reads/lookups on an exported crafted NTFS volume reach ntfs_attr_lookup(lowest_vcn!=0)-\u003entfs_external_attr_find() without local syscall access on the victim host.\nAC:L - Attacker fully controls on-disk $ATTRIBUTE_LIST tail geometry (short look-ahead entry length/placement); weak bounds let lowest_vcn/name reads pass al_end deterministically on walks with non-zero lowest_vcn, with no race or uncontrollable layout.\nPR:N - Per kernel CNA crafted-filesystem model, exploitation needs only supplying a malicious NTFS image (USB/automount) or read access to mounted/exported NTFS content to trigger extent lookups; no init-namespace root or CAP_SYS_ADMIN on the lookup/read path.\nUI:N - udisks2/systemd automount of removable NTFS and remote NFS/SMB reads on exported volumes reach the vulnerable attribute-list look-ahead during normal file/inode access without the victim deliberately mounting images or performing attacker-specific actions.\nS:U - Slab out-of-bounds read and possible kernel crash stay within the mounting host kernel; this is standard filesystem parsing, not a VM escape, IOMMU bypass, or cross-sandbox scope change.\nC:H - Unvalidated look-ahead reads next_al_entry-\u003elowest_vcn and the Unicode name past the kvmalloc attribute-list end (allocated at exact attr_list_size), disclosing adjacent slab heap memory beyond a few bytes.\nI:H - Attacker-controlled look-ahead entry fields drive kernel parsing of forged attribute-list metadata and adjacent slab contents; per CNA guidance this memory-corruption class can be leveraged for arbitrary kernel modification or control-flow hijack.\nA:H - Slab out-of-bounds read from the attribute-list buffer during inode/extent resolution can access unmapped adjacent memory and oops or panic the kernel, fully denying availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:00.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/44885c9b45eb4082fb7f558590d84bb254a08e94"
        },
        {
          "url": "https://git.kernel.org/stable/c/344b18f389f9934d59c7b0cf3d20541ea2e0da58"
        }
      ],
      "title": "ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80673",
    "datePublished": "2026-08-28T06:49:12.951Z",
    "dateReserved": "2026-08-26T14:34:25.782Z",
    "dateUpdated": "2026-08-29T06:22:00.387Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}