{"id":"CVE-2026-31555","summary":"futex: Clear stale exiting pointer in futex_lock_pi() retry path","details":"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 'exiting'.\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.","modified":"2026-05-18T05:58:44.567198960Z","published":"2026-04-24T14:35:39.211Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31555.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/210d36d892de5195e6766c45519dfb1e65f3eb83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5e8e06bf8909e79b4acd950cf578cfc2f10bbefa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/71112e62807d1925dc3ae6188b11f8cfc85aec23"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7475dfad10a05a5bfadebf5f2499bd61b19ed293"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92e47ad03e03dbb5515bdf06444bf6b1e147310d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de7c0c04ad868f2cee6671b11c0a6d20421af1da"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7824ec168d2ac883a213cd1f4d6cc0816002a85"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31555.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31555"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3ef240eaff36b8119ac9e2ea17cbf41179c930ba"},{"fixed":"33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa"},{"fixed":"e7824ec168d2ac883a213cd1f4d6cc0816002a85"},{"fixed":"5e8e06bf8909e79b4acd950cf578cfc2f10bbefa"},{"fixed":"de7c0c04ad868f2cee6671b11c0a6d20421af1da"},{"fixed":"7475dfad10a05a5bfadebf5f2499bd61b19ed293"},{"fixed":"92e47ad03e03dbb5515bdf06444bf6b1e147310d"},{"fixed":"71112e62807d1925dc3ae6188b11f8cfc85aec23"},{"fixed":"210d36d892de5195e6766c45519dfb1e65f3eb83"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"f2a9957e5c08b1b1caacd18a3dc4c0a1bdb7b463"},{"last_affected":"cf16e42709aa86aa3e37f3acc3d13d5715d90096"},{"last_affected":"61fa9f167caaa73d0a7c88f498eceeb12c6fa3db"},{"last_affected":"7874eee0130adf9bee28e8720bb5dd051089def3"},{"last_affected":"fc3b55ef2c840bb2746b2d8121a0788de84f7fac"}]}],"versions":["v4.9.254","v4.4.254","v4.19.171","v4.9.253","v4.4.253","v4.19.170","v4.19.169","v4.9.252","v4.4.252","v4.19.168","v4.19.167","v4.9.251","v4.4.251","v4.19.166","v4.9.250","v4.4.250","v4.19.165","v4.9.249","v4.4.249","v4.19.164","v4.19.163","v4.9.248","v4.4.248","v4.9.247","v4.4.247","v4.19.162","v4.19.161","v4.19.160","v4.9.246","v4.4.246","v4.19.159","v4.9.245","v4.4.245","v4.19.158","v4.9.244","v4.4.244","v4.19.157","v4.9.243","v4.4.243","v4.19.156","v4.9.242","v4.4.242","v4.19.155","v4.9.241","v4.4.241","v4.19.154","v4.19.153","v4.19.152","v4.9.240","v4.4.240","v4.4.239","v4.9.239","v4.19.151","v4.19.150","v4.9.238","v4.4.238","v4.19.149","v4.9.237","v4.19.148","v4.4.237","v4.19.147","v4.19.146","v4.9.236","v4.4.236","v4.19.145","v4.19.144","v4.9.235","v4.4.235","v4.19.143","v4.19.142","v4.9.234","v4.4.234","v4.19.141","v4.9.233","v4.4.233","v4.19.140","v4.9.232","v4.4.232","v4.19.139","v4.19.138","v4.19.137","v4.19.136","v4.19.135","v4.9.231","v4.4.231","v4.19.134","v4.19.133","v4.9.230","v4.4.230","v4.19.132","v4.19.131","v4.9.229","v4.4.229","v4.19.130","v4.9.228","v4.4.228","v4.19.129","v4.19.128","v4.9.227","v4.4.227","v4.9.226","v4.4.226","v4.19.127","v4.19.126","v4.19.125","v4.9.225","v4.4.225","v4.19.124","v4.9.224","v4.4.224","v4.19.123","v4.9.223","v4.4.223","v4.19.122","v4.19.121","v4.9.222","v4.4.222","v4.19.120","v4.9.221","v4.4.221","v4.19.119","v4.9.220","v4.4.220","v4.19.118","v4.9.219","v4.4.219","v4.19.117","v4.19.116","v4.19.115","v4.19.114","v4.9.218","v4.4.218","v4.4.217","v4.9.217","v4.19.113","v4.19.112","v4.19.111","v4.9.216","v4.4.216","v4.19.110","v4.19.109","v4.19.108","v4.9.215","v4.4.215","v4.19.107","v4.19.106","v4.9.214","v4.4.214","v4.19.105","v4.19.104","v4.19.103","v4.9.213","v4.4.213","v4.19.102","v4.19.101","v4.9.212","v4.4.212","v4.19.100","v4.19.99","v4.9.211","v4.4.211","v5.4","v4.19.98","v4.19.97","v4.9.210","v4.4.210","v4.19.96","v4.19.95","v4.9.209","v4.4.209","v4.19.94","v4.9.208","v4.4.208","v4.19.93","v4.19.92","v4.9.207","v4.4.207","v4.19.91","v4.19.90","v4.9.206","v4.4.206","v4.19.89","v4.19.88","v5.4-rc1","v4.14.157","v4.9.205","v4.4.205","v4.19.87","v5.4-rc6","v5.4-rc3","v4.19.86","v4.14.156","v4.9.204","v4.4.204","v4.9.203","v4.4.203","v5.4-rc4","v5.4-rc8","v4.4.202","v4.9.202","v4.14.155","v4.19.85","v4.19.84","v4.14.154","v5.4-rc7","v4.9.201","v4.4.201","v5.4-rc5","v5.3","v5.4-rc2","v4.19.83","v4.14.153","v4.9.200","v4.4.200","v4.19.82","v4.14.152","v4.9.199","v4.4.199","v4.19.81","v4.14.151","v4.9.198","v4.4.198","v4.19.80","v4.14.150","v4.9.197","v4.4.197","v4.19.79","v4.14.149","v4.9.196","v4.4.196","v4.19.78","v4.14.148","v4.4.195","v4.19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