{"api_version":"1","generated_at":"2026-06-25T16:12:35+00:00","cve":"CVE-2026-52973","urls":{"html":"https://cve.report/CVE-2026-52973","api":"https://cve.report/api/cve/CVE-2026-52973.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-52973","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-52973"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:07","updated_at":"2026-06-24 17:17:07"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091","name":"https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a","name":"https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1d","name":"https://git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52973","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52973","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d9b05321e21e4b218de4ce8a590bf375f58b6346 1dcd36420af2da5bd59306dba9caf78e3d248b1d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d9b05321e21e4b218de4ce8a590bf375f58b6346 974ac49a9a068b0591a59f65c63eb06579a13091 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d9b05321e21e4b218de4ce8a590bf375f58b6346 ee9dce44362b2d8132c32964656ab6dff7dfbc6a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/fork.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1dcd36420af2da5bd59306dba9caf78e3d248b1d","status":"affected","version":"d9b05321e21e4b218de4ce8a590bf375f58b6346","versionType":"git"},{"lessThan":"974ac49a9a068b0591a59f65c63eb06579a13091","status":"affected","version":"d9b05321e21e4b218de4ce8a590bf375f58b6346","versionType":"git"},{"lessThan":"ee9dce44362b2d8132c32964656ab6dff7dfbc6a","status":"affected","version":"d9b05321e21e4b218de4ce8a590bf375f58b6346","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/fork.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-06-24T16:28:51.171Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1d"},{"url":"https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091"},{"url":"https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a"}],"title":"futex: Drop CLONE_THREAD requirement for private default hash alloc","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-52973","datePublished":"2026-06-24T16:28:51.171Z","dateReserved":"2026-06-09T07:44:35.375Z","dateUpdated":"2026-06-24T16:28:51.171Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 17:17:07","lastModifiedDate":"2026-06-24 17:17:07","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"52973","Ordinal":"1","Title":"futex: Drop CLONE_THREAD requirement for private default hash al","CVE":"CVE-2026-52973","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"52973","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"futex: Drop CLONE_THREAD requirement for private default hash al"}]}}}