{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669"
            },
            {
              "fixed": "c7a7e48e71ce915ec4cbd6e9f355590c1ecbc29a"
            },
            {
              "fixed": "98634df5b1cb56c26299b7409227025ddb0167d8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.1.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80869.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: bound the attribute-list entry in ntfs_read_inode_mount()\n\nThe $MFT attribute-list walk in ntfs_read_inode_mount() validates each\nentry only with \"(u8 *)al_entry + 6 \u003e al_end\" and\n\"(u8 *)al_entry + le16_to_cpu(al_entry-\u003elength) \u003e al_end\", but then reads\nal_entry-\u003elowest_vcn (an __le64 at offset 8) and al_entry-\u003emft_reference\n(offset 16) -- fields beyond the 6 bytes proven in range. al_entry-\u003elength\nis attacker-controlled and only required non-zero, so a short entry (e.g.\nlength 8) placed at the tail passes both checks while the lowest_vcn /\nmft_reference reads fall past al_end.\n\nal_end is ni-\u003eattr_list + attr_list_size (the on-disk size); the buffer is\nkvzalloc(round_up(attr_list_size, SECTOR_SIZE)), so the sector rounding\nusually absorbs the over-read -- but when attr_list_size is a multiple of\nSECTOR_SIZE there is no slack and a crafted $MFT attribute list produces an\nout-of-bounds read at mount time.\n\nValidate the entry with ntfs_attr_list_entry_is_valid() (added in patch\n1/3) before dereferencing it, matching the bound the other attribute-list\nwalks now use. The validator already requires the length to cover the fixed\nheader, which makes the separate \"!al_entry-\u003elength\" check redundant, so\ndrop it too.",
  "id": "CVE-2026-80869",
  "modified": "2026-09-06T03:30:51.471752040Z",
  "published": "2026-09-04T16:48:27.068Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98634df5b1cb56c26299b7409227025ddb0167d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7a7e48e71ce915ec4cbd6e9f355590c1ecbc29a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80869.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80869"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ntfs: bound the attribute-list entry in ntfs_read_inode_mount()"
}