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CVE-2026-31555 (GCVE-0-2026-31555)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-09-08 08:47
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
Affected: 4.4.255 , < 4.5 (semver)
Affected: 4.9.255 , < 4.10 (semver)
Affected: 4.14.158 , < 4.15 (semver)
Affected: 4.19.172 , < 4.20 (semver)
Affected: 5.4.1 , < 5.5 (semver)
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Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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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."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31555\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:29.837\",\"lastModified\":\"2026-07-14T13:18:45.463\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/futex/pi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"e7824ec168d2ac883a213cd1f4d6cc0816002a85\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"5e8e06bf8909e79b4acd950cf578cfc2f10bbefa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"de7c0c04ad868f2cee6671b11c0a6d20421af1da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"7475dfad10a05a5bfadebf5f2499bd61b19ed293\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"92e47ad03e03dbb5515bdf06444bf6b1e147310d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"71112e62807d1925dc3ae6188b11f8cfc85aec23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ef240eaff36b8119ac9e2ea17cbf41179c930ba\",\"lessThan\":\"210d36d892de5195e6766c45519dfb1e65f3eb83\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2a9957e5c08b1b1caacd18a3dc4c0a1bdb7b463\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf16e42709aa86aa3e37f3acc3d13d5715d90096\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61fa9f167caaa73d0a7c88f498eceeb12c6fa3db\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7874eee0130adf9bee28e8720bb5dd051089def3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc3b55ef2c840bb2746b2d8121a0788de84f7fac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.4.255\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.9.255\",\"lessThan\":\"4.10\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.14.158\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.172\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.1\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/futex/pi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.168\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.131\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.80\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.21\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.11\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.5\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"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-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/71112e62807d1925dc3ae6188b11f8cfc85aec23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7475dfad10a05a5bfadebf5f2499bd61b19ed293\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/92e47ad03e03dbb5515bdf06444bf6b1e147310d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/de7c0c04ad868f2cee6671b11c0a6d20421af1da\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e7824ec168d2ac883a213cd1f4d6cc0816002a85\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T23:44:33+00:00",
      "cve": "CVE-2026-31555",
      "id": "CVE-2026-31555",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:fixed": "303",
      "product_status:known_affected": "174",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: futex: Clear stale exiting pointer in futex_lock_pi() retry path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31555.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:30:49Z",
      "cve": "CVE-2026-31555",
      "id": "CVE-2026-31555",
      "initial_release_date": "2026-04-25T01:39:34Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "530",
      "product_status:known_not_affected": "180",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31555",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31555.json",
      "version": "24"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.