{"id":"CVE-2026-80674","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80674","summary":"ntfs: validate resident attribute lists and harden the validator","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: validate resident attribute lists and harden the validator\n\nA base inode's $ATTRIBUTE_LIST is sanity-checked by load_attribute_list()\nonly on the non-resident path; ntfs_read_locked_inode() copies a *resident*\nattribute list into ni->attr_list with a plain memcpy() and no validation\nat all. Every subsequent walk of ni->attr_list --\nntfs_external_attr_find(), ntfs_inode_attach_all_extents() and\nntfs_attrlist_need() -- then trusts the entries are well-formed and reads\nattr_list_entry fixed-header fields\n(lowest_vcn at offset 8, mft_reference at offset 16, and the name) with\nbounds that assume validation already happened. A crafted resident\nattribute list therefore reaches those walks unvalidated and can drive\nout-of-bounds reads of the attribute-list buffer.\n\nload_attribute_list() itself reads ale->name_offset (offset 7),\nale->mft_reference (offset 16) and the name length under only an\n\"al < al_start + size\" bound, so its own validation loop can over-read the\nfixed header of a truncated trailing entry by a few bytes.\n\nFactor the per-entry validation into ntfs_attr_list_entry_is_valid(),\nwhich requires each entry's fixed header (offsetof(struct\nattr_list_entry, name)) to be in range before any field is dereferenced,\nthat ale->length is a multiple of 8 covering the fixed header plus the\nname, and that the entry is in use and carries a live MFT reference.\nntfs_attr_list_is_valid() walks the buffer with it and checks the entries\ntile it exactly. Use the list validator in load_attribute_list()\n(replacing the open-coded loop, closing its own over-read) and on the\nresident path in ntfs_read_locked_inode() (which previously skipped\nvalidation entirely); patches 2/3 reuse the per-entry helper at the other\ntwo attribute-list walks.","published":"2026-08-28T06:49:13.549Z","modified":"2026-08-30T03:48:20.929400246Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"7.1.5"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/55e97648f7753c6097cb682d24d1abcfe878e812"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d19e1ffee084c4f7d321a360c14ba43404f7cc8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80674.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80674"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-30T03:48:20.929400246Z"}}