{"id":"CVE-2026-99169","revision":"3ee36ac203984c9aaaab052f6a50ec8b","records":[{"revision":"3ee36ac203984c9aaaab052f6a50ec8b","observedAt":"2026-10-28T11:27:43.363+00:00","statement":{"source":"cve-program","id":"CVE-2026-99169","aliases":[],"title":"futex: Fix mm reuse handling for FUT_OFF_MMSHARED","description":"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.)","state":0,"publishedAt":"2026-10-28T10:35:20.17+00:00","modifiedAt":"2026-10-28T10:35:20.17+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"include/linux/futex.h\",\n                        \"include/linux/futex_types.h\",\n                        \"kernel/futex/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"222993395ed38f3751287f4bd82ef46b3eb3a66d\",\n                            \"lessThan\": \"c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"222993395ed38f3751287f4bd82ef46b3eb3a66d\",\n                            \"lessThan\": \"2855ddc6844f527e375e78afb55ec2a5182f23b3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"222993395ed38f3751287f4bd82ef46b3eb3a66d\",\n                            \"lessThan\": \"3267512ad1c2cc0c7768c5b014dc2cceb398a801\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"include/linux/futex.h\",\n                        \"include/linux/futex_types.h\",\n                        \"kernel/futex/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.59\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.13\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81","https://git.kernel.org/stable/c/2855ddc6844f527e375e78afb55ec2a5182f23b3","https://git.kernel.org/stable/c/3267512ad1c2cc0c7768c5b014dc2cceb398a801"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99169","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99169","identifiers":["CVE-2026-99169"]},"retained":false,"historicalAffected":[]}],"coverage":[]}