{"id":"CVE-2026-52973","revision":"7324c58c07634f099430c11bffe4857c","records":[{"revision":"7324c58c07634f099430c11bffe4857c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52973","aliases":[],"title":"futex: Drop CLONE_THREAD requirement for private default hash alloc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Drop CLONE_THREAD requirement for private default hash alloc\n\nCurrently need_futex_hash_allocate_default() depends on strict pthread\nsemantics, abusing CLONE_THREAD.  This breaks the non-concurrency\nassumptions when doing the mm->futex_ref pcpu allocations, leading to\nbugs[0] when sharing the mm in other ways; ie:\n\n    BUG: KASAN: slab-use-after-free in futex_hash_put\n\n... where the +1 bias can end up on a percpu counter that mm->futex_ref\nno longer points at.\n\nLoosen the check to cover any CLONE_VM clone, except vfork().  Excluding\nvfork keeps the existing paths untouched (no overhead), and we can't\nrace in the first place: either the parent is suspended and the child\nruns alone, or mm->futex_ref is already allocated from an earlier\nCLONE_VM.","state":0,"publishedAt":"2026-06-24T16:28:51.171+00:00","modifiedAt":"2026-10-19T19:47:11.166+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                        \"kernel/fork.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d9b05321e21e4b218de4ce8a590bf375f58b6346\",\n                            \"lessThan\": \"1dcd36420af2da5bd59306dba9caf78e3d248b1d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d9b05321e21e4b218de4ce8a590bf375f58b6346\",\n                            \"lessThan\": \"974ac49a9a068b0591a59f65c63eb06579a13091\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d9b05321e21e4b218de4ce8a590bf375f58b6346\",\n                            \"lessThan\": \"ee9dce44362b2d8132c32964656ab6dff7dfbc6a\",\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                        \"kernel/fork.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.33\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.10\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1d","https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091","https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52973","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52973","identifiers":["CVE-2026-52973"]},"retained":false,"historicalAffected":[]}],"coverage":[]}