{"schema":"threatline.record/2","record":{"id":"CVE-2026-99169","aliases":[],"summary":"futex: Fix mm reuse handling for FUT_OFF_MMSHARED","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Fix mm reuse handling for FUT_OFF_MMSHARED\n\nA FUT_OFF_MMSHARED futex is a shared futex that refers to an MM.\nIt is possible for a process to wait on a shared futex with a different MM\nbecause a FUT_OFF_INODE waiter can be requeued onto a FUT_OFF_MMSHARED\nfutex by another process.\nThis can cause FUT_OFF_MMSHARED waiters on a freed MM to consume\nwakeups intended for a newly allocated MM at the same address.\n\nFix it by keying FUT_OFF_MMSHARED using a unique 64-bit per-MM ID.\nLeave private futexes as before to avoid influencing the performance of the\nhotpath.\n\n(Multi-threaded processes typically implicitly use FUT_OFF_MMSHARED by\nsetting clear_child_tid such that it points into anonymous memory, which\ncauses mm_release() in a multi-threaded mm to perform FUTEX_WAKE.)","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99169","source_modified_at":"2026-10-28T10:35:20.170Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"222993395ed38f3751287f4bd82ef46b3eb3a66d","lessThan":"c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81","status":"affected","versionType":"git"},{"version":"222993395ed38f3751287f4bd82ef46b3eb3a66d","lessThan":"2855ddc6844f527e375e78afb55ec2a5182f23b3","status":"affected","versionType":"git"},{"version":"222993395ed38f3751287f4bd82ef46b3eb3a66d","lessThan":"3267512ad1c2cc0c7768c5b014dc2cceb398a801","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99169","source_modified_at":"2026-10-28T10:35:20.170Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.7","status":"affected"},{"version":"0","lessThan":"5.7","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-2026-99169","source_modified_at":"2026-10-28T10:35:20.170Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"2855ddc6844f527e375e78afb55ec2a5182f23b3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99169","source_modified_at":"2026-10-28T10:35:20.170Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"3267512ad1c2cc0c7768c5b014dc2cceb398a801","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":"2026-10-28T10:35:20.170Z","modified_at":"2026-10-28T10:35:20.170Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99169","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:35:20.170Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2855ddc6844f527e375e78afb55ec2a5182f23b3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3267512ad1c2cc0c7768c5b014dc2cceb398a801"}],"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":"2026-10-28T10:35:20.170Z","content_hash":"b5d81986c2d56f2f7756e86167faeac6d64f8bf5c4ce6caa4856123b933bbc0d"}}