{"id":"CVE-2026-80673","title":"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() …","summary":"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() …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","published":"2026-08-28","updated":"2026-08-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80673","references":[{"url":"https://git.kernel.org/stable/c/344b18f389f9934d59c7b0cf3d20541ea2e0da58","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/44885c9b45eb4082fb7f558590d84bb254a08e94","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80673.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80673"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2525367"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80673"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80673"},{"url":"https://lore.kernel.org/linux-cve-announce/2026082848-CVE-2026-80673-fe8f@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.00553,"epssPercentile":0.46016,"ingestedAt":"2026-08-30T04:47:10.165Z","vendor":"Red Hat","cwe":["CWE-125"],"scores":{"nvd":9.8,"vendor":5.5},"slug":"CVE-2026-80673","body":"## Overview\n\nIn 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 < al_end\" (which proves just\nbytes 0..6 are in range) and \"(u8 *)next_al_entry + length <= al_end\"\nwith an attacker-controlled, non-8-aligned length. It then reads\nnext_al_entry->lowest_vcn (an __le64 at offset 8) and the name at\nnext_al_entry->name_offset, both of which can lie past al_end -- the\nexact end of the kvmalloc'd 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80673.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}