{"id":"CVE-2026-89611","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89611","summary":"ntfs: validate non-resident attribute offsets","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: validate non-resident attribute offsets\n\nntfs_attr_update_meta() shifts the attribute name when converting between\nnon-sparse and sparse attributes. Converting to sparse also adds the\ncompressed_size field before the name and mapping pairs, requiring eight\nadditional bytes in the attribute record.\n\nHowever, the validator does not check that name_offset is within safe\nboundaries for these operations or that the additional space is available.\nA malicious MFT record could set name_offset such that:\n\n1. The name is positioned at the very end of a non-sparse attribute.\n   Converting to sparse would shift the name forward by 8 bytes,\n   writing beyond the attribute boundary.\n\n2. The name overlaps with the mapping pairs, causing corruption during\n   conversion.\n\nAdd validation to ensure:\n- For named attributes, name_offset is within valid bounds\n- Name does not extend beyond the attribute or overlap with mapping pairs\n- For non-sparse, non-compressed attributes, eight bytes are available\n  after mapping_pairs_offset for the compressed_size field\n\nThe space check also covers unnamed attributes, for which name_offset = 0\nis valid and no name range needs to be checked.","published":"2026-09-11T19:45:12.646Z","modified":"2026-09-14T03:46:18.176956596Z","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":"7.2.4"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd7b3dc7557faadeea626034e3bac68a449851ef"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89611.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89611"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-14T03:46:18.176956596Z"}}