{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80776", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.792Z", "datePublished": "2026-09-04T15:12:48.314Z", "dateUpdated": "2026-09-04T15:12:48.314Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T15:12:48.314Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Fix race in futex_pivot_pending() during private hash resize\n\nA task performing a custom private hash resize can remain blocked in\nuninterruptible sleep indefinitely. The hung-task detector reports:\n\n INFO: task futex-resizer:314 blocked for more than 10 seconds.\n task:futex-resizer state:D stack:14824 pid:314 tgid:312 ppid:311\n\n Call Trace:\n __schedule+0x521/0xf30\n schedule+0x22/0xa0\n futex_hash_allocate+0x3db/0x490\n __do_sys_prctl+0x6f5/0xbd0\n do_syscall_64+0xf9/0x530\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Kernel panic - not syncing: hung_task: blocked tasks\n\nfutex_pivot_pending() allows the resize request to continue when\neither no replacement hash is pending (hash_new == NULL) or the current\nhash reference count has reached zero.\n\nAfter the final-reference wake, another futex task can complete the\npivot between the two observations:\n\n T1 T2\n\n futex_hash_allocate()\n wait_var_event(mm, ...)\n futex_pivot_pending(mm)\n hash_new != NULL\n futex_hash()\n futex_ref_get(old) -> false\n futex_pivot_hash(mm)\n hash_new = NULL\n __futex_pivot_hash(mm, new)\n rcu_assign_pointer(hash, new)\n fph = rcu_dereference(hash) /* new */\n futex_ref_is_dead(fph) -> false\n schedule()\n\nThe pivot changes the state from hash_new != NULL with a dead current\nhash to hash_new == NULL with a live current hash. Because\nfutex_pivot_pending() reads hash_new and hash without serialization,\nthe resize task can observe hash_new in the pre-pivot state and hash in\nthe post-pivot state, causing futex_pivot_pending() to return false even\nthough the pivot has completed. The task then goes to sleep after the\nwakeup has already been consumed.\n\nSerialize state reads in futex_pivot_pending() using futex_mm_phash::lock.\nThis guarantees that futex_pivot_pending() observes hash_new and hash\natomically, eliminating the race condition."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/futex/core.c"], "versions": [{"version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba", "lessThan": "4a7e941ca29a608c6244cbd028d3599ecaef7207", "status": "affected", "versionType": "git"}, {"version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba", "lessThan": "19b4be0717fa83265d66aea836b7022d898422cf", "status": "affected", "versionType": "git"}, {"version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba", "lessThan": "8e7ff730dd96519a333d1570edf1c3fabb6d3629", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/futex/core.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.11", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4a7e941ca29a608c6244cbd028d3599ecaef7207"}, {"url": "https://git.kernel.org/stable/c/19b4be0717fa83265d66aea836b7022d898422cf"}, {"url": "https://git.kernel.org/stable/c/8e7ff730dd96519a333d1570edf1c3fabb6d3629"}], "title": "futex: Fix race in futex_pivot_pending() during private hash resize", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/futex/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4a7e941ca29a608c6244cbd028d3599ecaef7207", "status": "affected", "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba", "versionType": "git"}, {"lessThan": "19b4be0717fa83265d66aea836b7022d898422cf", "status": "affected", "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba", "versionType": "git"}, {"lessThan": "8e7ff730dd96519a333d1570edf1c3fabb6d3629", "status": "affected", "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/futex/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.46", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Fix race in futex_pivot_pending() during private hash resize\n\nA task performing a custom private hash resize can remain blocked in\nuninterruptible sleep indefinitely. The hung-task detector reports:\n\n INFO: task futex-resizer:314 blocked for more than 10 seconds.\n task:futex-resizer state:D stack:14824 pid:314 tgid:312 ppid:311\n\n Call Trace:\n __schedule+0x521/0xf30\n schedule+0x22/0xa0\n futex_hash_allocate+0x3db/0x490\n __do_sys_prctl+0x6f5/0xbd0\n do_syscall_64+0xf9/0x530\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Kernel panic - not syncing: hung_task: blocked tasks\n\nfutex_pivot_pending() allows the resize request to continue when\neither no replacement hash is pending (hash_new == NULL) or the current\nhash reference count has reached zero.\n\nAfter the final-reference wake, another futex task can complete the\npivot between the two observations:\n\n T1 T2\n\n futex_hash_allocate()\n wait_var_event(mm, ...)\n futex_pivot_pending(mm)\n hash_new != NULL\n futex_hash()\n futex_ref_get(old) -> false\n futex_pivot_hash(mm)\n hash_new = NULL\n __futex_pivot_hash(mm, new)\n rcu_assign_pointer(hash, new)\n fph = rcu_dereference(hash) /* new */\n futex_ref_is_dead(fph) -> false\n schedule()\n\nThe pivot changes the state from hash_new != NULL with a dead current\nhash to hash_new == NULL with a live current hash. Because\nfutex_pivot_pending() reads hash_new and hash without serialization,\nthe resize task can observe hash_new in the pre-pivot state and hash in\nthe post-pivot state, causing futex_pivot_pending() to return false even\nthough the pivot has completed. The task then goes to sleep after the\nwakeup has already been consumed.\n\nSerialize state reads in futex_pivot_pending() using futex_mm_phash::lock.\nThis guarantees that futex_pivot_pending() observes hash_new and hash\natomically, eliminating the race condition."}], "id": "CVE-2026-80776", "lastModified": "2026-09-04T16:18:03.250", "metrics": {}, "published": "2026-09-04T16:18:03.250", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/19b4be0717fa83265d66aea836b7022d898422cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a7e941ca29a608c6244cbd028d3599ecaef7207"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e7ff730dd96519a333d1570edf1c3fabb6d3629"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd54df5ea7cadac520e346d5f0fe5d58e635b6ba,4a7e941ca29a608c6244cbd028d3599ecaef7207)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd54df5ea7cadac520e346d5f0fe5d58e635b6ba,19b4be0717fa83265d66aea836b7022d898422cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd54df5ea7cadac520e346d5f0fe5d58e635b6ba,8e7ff730dd96519a333d1570edf1c3fabb6d3629)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.46,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.11,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-04T17:15:14.591467+00:00", "updated": "2026-09-04T18:30:04.171788+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}