{"schema":"threatline.record/2","record":{"id":"CVE-2026-99110","aliases":[],"summary":"smb: client: fix heap overflow in cifs_do_set_acl()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix heap overflow in cifs_do_set_acl()\n\ncifs_set_acl() validates ACL size using posix_acl_xattr_size():\n\n        4 + (count * 8)  // 4-byte header + 8 bytes per ACE\n\ncifs_do_set_acl() then calls posix_acl_to_cifs() to write the CIFS\nwire format into the same buffer:\n\n        6 + (count * 10)  // 6-byte header + 10 bytes per ACE\n\nAn ACL that passes the xattr-based check in cifs_set_acl() can\noverflow the heap when posix_acl_to_cifs() writes the larger CIFS\nformat.\n\nValidate the CIFS format size against the remaining buffer space and\nUSHRT_MAX before converting--data_count is __u16, so sizes above\nUSHRT_MAX truncate the on-wire packet length, causing the server to\napply a partial ACL.  Replace MaxDataCount = 1000 with\nmin(CIFSMaxBufSize, USHRT_MAX).","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99110","source_modified_at":"2026-10-28T10:34:28.239Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"dc1af4c4b4721abfa07b351063825acc7e69cc66","lessThan":"d96f3365ce61c5f39602955af43c8174548dee98","status":"affected","versionType":"git"},{"version":"dc1af4c4b4721abfa07b351063825acc7e69cc66","lessThan":"596b4062e6c75bdd85a7f2b7f2087a872dc420ac","status":"affected","versionType":"git"},{"version":"dc1af4c4b4721abfa07b351063825acc7e69cc66","lessThan":"1dac61e2c29d1a71784604b48cf3b1234a65ec29","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99110","source_modified_at":"2026-10-28T10:34:28.239Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.2","status":"affected"},{"version":"0","lessThan":"6.2","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","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-2026-99110","source_modified_at":"2026-10-28T10:34:28.239Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"596b4062e6c75bdd85a7f2b7f2087a872dc420ac","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99110","source_modified_at":"2026-10-28T10:34:28.239Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"1dac61e2c29d1a71784604b48cf3b1234a65ec29","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T10:34:28.239Z","modified_at":"2026-10-28T10:34:28.239Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99110","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:34:28.239Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/d96f3365ce61c5f39602955af43c8174548dee98"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/596b4062e6c75bdd85a7f2b7f2087a872dc420ac"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1dac61e2c29d1a71784604b48cf3b1234a65ec29"}],"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":"2026-10-28T10:34:28.239Z","content_hash":"b791ff5e964c981c24d2d32125705dce6676004fd55aeaa86b147dca705b1f72"}}