{"schema":"threatline.record/2","record":{"id":"CVE-2026-97554","aliases":[],"summary":"smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()\n\ncifs_posix_to_fattr() ignores the return value of posix_info_parse().\nWhen a malformed POSIX directory entry is encountered (e.g. invalid\nSID lengths from an untrusted server), posix_info_parse() returns -1\nwithout populating the 'parsed' struct.  The uninitialized stack\nmemory in parsed.owner and parsed.group is then passed to\nsid_to_id(), which processes the garbage bytes and passes them to\nrequest_key() to construct a SID string, potentially leaking kernel\nstack contents to the userspace idmap daemon.\n\nFix this by checking the return value and skipping the SID-to-id\nmapping when parsing fails.  The remaining fattr fields (timestamps,\nmode, etc.) are populated directly from the 'info' pointer so they\nare unaffected.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"9934430e2178d5164eb1ac91a9b092f9e7e64745","lessThan":"604feb3e8141bf11f5afd48d36d401fee5af9536","status":"affected","versionType":"git"},{"version":"9934430e2178d5164eb1ac91a9b092f9e7e64745","lessThan":"33106019c3be57b5fc6411cfaad6d98214a51265","status":"affected","versionType":"git"},{"version":"9934430e2178d5164eb1ac91a9b092f9e7e64745","lessThan":"2be31f252ade791b84f7164991f14436aed1d4b9","status":"affected","versionType":"git"},{"version":"9934430e2178d5164eb1ac91a9b092f9e7e64745","lessThan":"c9a8b60ce140a68d172452f418137fc7ddbae7db","status":"affected","versionType":"git"},{"version":"9934430e2178d5164eb1ac91a9b092f9e7e64745","lessThan":"da6e25842431982d5a53cf00d925b98c690f4467","status":"affected","versionType":"git"},{"version":"dd80b98bdf0a4b3206739f3513b0518f27a7b4ef","status":"affected","versionType":"git"},{"version":"d8e39c11f66125f49de55537a6efc8ecadf4a0f7","status":"affected","versionType":"git"},{"version":"5.8.17","lessThan":"5.9","status":"affected","versionType":"semver"},{"version":"5.9.2","lessThan":"5.10","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.10","status":"affected"},{"version":"0","lessThan":"5.10","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.114","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"604feb3e8141bf11f5afd48d36d401fee5af9536","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"33106019c3be57b5fc6411cfaad6d98214a51265","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2be31f252ade791b84f7164991f14436aed1d4b9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","source_modified_at":"2026-10-21T12:53:14.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.10","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09342,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:21:45.851Z","modified_at":"2026-10-21T12:53:14.914Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97554","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:53:14.914Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97554","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/604feb3e8141bf11f5afd48d36d401fee5af9536"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/33106019c3be57b5fc6411cfaad6d98214a51265"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2be31f252ade791b84f7164991f14436aed1d4b9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c9a8b60ce140a68d172452f418137fc7ddbae7db"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/da6e25842431982d5a53cf00d925b98c690f4467"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:53:14.914Z","content_hash":"129f9a16d692cb79eef8bc2ac37fdd60121889fafc8d544524a48a56d6d37223"}}