143 lines
8.0 KiB
JSON
143 lines
8.0 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80776",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.792Z",
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"datePublished": "2026-09-04T15:12:48.314Z",
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"dateUpdated": "2026-09-04T15:12:48.314Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-09-04T15:12:48.314Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/futex/core.c"
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],
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"versions": [
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{
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"version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
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"lessThan": "4a7e941ca29a608c6244cbd028d3599ecaef7207",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
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"lessThan": "19b4be0717fa83265d66aea836b7022d898422cf",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
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"lessThan": "8e7ff730dd96519a333d1570edf1c3fabb6d3629",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/futex/core.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.46",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.11",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.46"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.1.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4a7e941ca29a608c6244cbd028d3599ecaef7207"
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},
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{
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"url": "https://git.kernel.org/stable/c/19b4be0717fa83265d66aea836b7022d898422cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/8e7ff730dd96519a333d1570edf1c3fabb6d3629"
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}
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],
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"title": "futex: Fix race in futex_pivot_pending() during private hash resize",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |