CVE-2026-31555 (GCVE-0-2026-31555)
Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-04-24 14:35
VLAI?
Title
futex: Clear stale exiting pointer in futex_lock_pi() retry path
Summary
In the Linux kernel, the following vulnerability has been resolved:
futex: Clear stale exiting pointer in futex_lock_pi() retry path
Fuzzying/stressing futexes triggered:
WARNING: kernel/futex/core.c:825 at wait_for_owner_exiting+0x7a/0x80, CPU#11: futex_lock_pi_s/524
When futex_lock_pi_atomic() sees the owner is exiting, it returns -EBUSY
and stores a refcounted task pointer in 'exiting'.
After wait_for_owner_exiting() consumes that reference, the local pointer
is never reset to nil. Upon a retry, if futex_lock_pi_atomic() returns a
different error, the bogus pointer is passed to wait_for_owner_exiting().
CPU0 CPU1 CPU2
futex_lock_pi(uaddr)
// acquires the PI futex
exit()
futex_cleanup_begin()
futex_state = EXITING;
futex_lock_pi(uaddr)
futex_lock_pi_atomic()
attach_to_pi_owner()
// observes EXITING
*exiting = owner; // takes ref
return -EBUSY
wait_for_owner_exiting(-EBUSY, owner)
put_task_struct(); // drops ref
// exiting still points to owner
goto retry;
futex_lock_pi_atomic()
lock_pi_update_atomic()
cmpxchg(uaddr)
*uaddr ^= WAITERS // whatever
// value changed
return -EAGAIN;
wait_for_owner_exiting(-EAGAIN, exiting) // stale
WARN_ON_ONCE(exiting)
Fix this by resetting upon retry, essentially aligning it with requeue_pi.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < 33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa
(git)
Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < e7824ec168d2ac883a213cd1f4d6cc0816002a85 (git) Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < 5e8e06bf8909e79b4acd950cf578cfc2f10bbefa (git) Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < de7c0c04ad868f2cee6671b11c0a6d20421af1da (git) Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < 7475dfad10a05a5bfadebf5f2499bd61b19ed293 (git) Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < 92e47ad03e03dbb5515bdf06444bf6b1e147310d (git) Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < 71112e62807d1925dc3ae6188b11f8cfc85aec23 (git) Affected: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba , < 210d36d892de5195e6766c45519dfb1e65f3eb83 (git) Affected: f2a9957e5c08b1b1caacd18a3dc4c0a1bdb7b463 (git) Affected: cf16e42709aa86aa3e37f3acc3d13d5715d90096 (git) Affected: 61fa9f167caaa73d0a7c88f498eceeb12c6fa3db (git) Affected: 7874eee0130adf9bee28e8720bb5dd051089def3 (git) Affected: fc3b55ef2c840bb2746b2d8121a0788de84f7fac (git) |
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|
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Clear stale exiting pointer in futex_lock_pi() retry path\n\nFuzzying/stressing futexes triggered:\n\n WARNING: kernel/futex/core.c:825 at wait_for_owner_exiting+0x7a/0x80, CPU#11: futex_lock_pi_s/524\n\nWhen futex_lock_pi_atomic() sees the owner is exiting, it returns -EBUSY\nand stores a refcounted task pointer in \u0027exiting\u0027.\n\nAfter wait_for_owner_exiting() consumes that reference, the local pointer\nis never reset to nil. Upon a retry, if futex_lock_pi_atomic() returns a\ndifferent error, the bogus pointer is passed to wait_for_owner_exiting().\n\n CPU0\t\t\t CPU1\t\t CPU2\n futex_lock_pi(uaddr)\n // acquires the PI futex\n exit()\n futex_cleanup_begin()\n futex_state = EXITING;\n\t\t\t futex_lock_pi(uaddr)\n\t\t\t futex_lock_pi_atomic()\n\t\t\t\t attach_to_pi_owner()\n\t\t\t\t // observes EXITING\n\t\t\t\t *exiting = owner; // takes ref\n\t\t\t\t return -EBUSY\n\t\t\t wait_for_owner_exiting(-EBUSY, owner)\n\t\t\t\t put_task_struct(); // drops ref\n\t\t\t // exiting still points to owner\n\t\t\t goto retry;\n\t\t\t futex_lock_pi_atomic()\n\t\t\t\t lock_pi_update_atomic()\n\t\t\t\t cmpxchg(uaddr)\n\t\t\t\t\t*uaddr ^= WAITERS // whatever\n\t\t\t\t // value changed\n\t\t\t\t return -EAGAIN;\n\t\t\t wait_for_owner_exiting(-EAGAIN, exiting) // stale\n\t\t\t\t WARN_ON_ONCE(exiting)\n\nFix this by resetting upon retry, essentially aligning it with requeue_pi."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T14:35:39.211Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
"url": "https://git.kernel.org/stable/c/210d36d892de5195e6766c45519dfb1e65f3eb83"
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"title": "futex: Clear stale exiting pointer in futex_lock_pi() retry path",
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"cveId": "CVE-2026-31555",
"datePublished": "2026-04-24T14:35:39.211Z",
"dateReserved": "2026-03-09T15:48:24.115Z",
"dateUpdated": "2026-04-24T14:35:39.211Z",
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"date": "2026-05-04",
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Upon a retry, if futex_lock_pi_atomic() returns a\\ndifferent error, the bogus pointer is passed to wait_for_owner_exiting().\\n\\n CPU0\\t\\t\\t CPU1\\t\\t CPU2\\n futex_lock_pi(uaddr)\\n // acquires the PI futex\\n exit()\\n futex_cleanup_begin()\\n futex_state = EXITING;\\n\\t\\t\\t futex_lock_pi(uaddr)\\n\\t\\t\\t futex_lock_pi_atomic()\\n\\t\\t\\t\\t attach_to_pi_owner()\\n\\t\\t\\t\\t // observes EXITING\\n\\t\\t\\t\\t *exiting = owner; // takes ref\\n\\t\\t\\t\\t return -EBUSY\\n\\t\\t\\t wait_for_owner_exiting(-EBUSY, owner)\\n\\t\\t\\t\\t put_task_struct(); // drops ref\\n\\t\\t\\t // exiting still points to owner\\n\\t\\t\\t goto retry;\\n\\t\\t\\t futex_lock_pi_atomic()\\n\\t\\t\\t\\t lock_pi_update_atomic()\\n\\t\\t\\t\\t cmpxchg(uaddr)\\n\\t\\t\\t\\t\\t*uaddr ^= WAITERS // whatever\\n\\t\\t\\t\\t // value changed\\n\\t\\t\\t\\t return -EAGAIN;\\n\\t\\t\\t wait_for_owner_exiting(-EAGAIN, exiting) // stale\\n\\t\\t\\t\\t WARN_ON_ONCE(exiting)\\n\\nFix this by resetting upon retry, essentially aligning it with requeue_pi.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.4.255\",\"versionEndExcluding\":\"4.5\",\"matchCriteriaId\":\"39A57944-7654-4465-9F2B-4DC1CB18ADFB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9.255\",\"versionEndExcluding\":\"4.10\",\"matchCriteriaId\":\"F932A542-7872-4F86-AD1E-00CCC240C25D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.158\",\"versionEndExcluding\":\"4.15\",\"matchCriteriaId\":\"C62F59A2-9EFC-4E7F-B9E7-3DFF4E885406\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.172\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"235BE773-4E0B-4AD6-9314-D176A65C4B73\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.1\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"025DC0BA-08A8-4703-AE9F-7C3D8E346A45\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5.1\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"45E871E1-B00E-4E88-83A3-60B38EAF2B8A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.168\",\"matchCriteriaId\":\"E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.131\",\"matchCriteriaId\":\"CE6ED4D4-0046-4573-BFA9-D64143B6A89F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.80\",\"matchCriteriaId\":\"97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.21\",\"matchCriteriaId\":\"ED39847A-3B46-4729-B7CA-B2C30B9FA8FE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.11\",\"matchCriteriaId\":\"4CA2E747-A9EC-4518-9AA2-B4247FC748B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.5:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"EE98F46A-F7D9-4609-B6A0-882E7F0D378C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/210d36d892de5195e6766c45519dfb1e65f3eb83\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5e8e06bf8909e79b4acd950cf578cfc2f10bbefa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081f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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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