{"id":"CVE-2026-53166","summary":"futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfutex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock\n\nWhen FUTEX_CMP_REQUEUE_PI requeues a non-top waiter that already owns the\ntarget PI futex, task_blocks_on_rt_mutex() returns -EDEADLK before setting\nwaiter-\u003etask.\n\nThe subsequent remove_waiter() in rt_mutex_start_proxy_lock() dereferences\nthe NULL waiter-\u003etask, causing a kernel crash.\n\nAdd a self-deadlock check for non-top waiters before calling\nrt_mutex_start_proxy_lock(), analogous to the top-waiter check in\nfutex_lock_pi_atomic().","modified":"2026-07-09T14:44:32.917074736Z","published":"2026-06-25T08:38:46.089Z","related":["CGA-f72v-p825-9fwv"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53166.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/16f8e17184b31382076f84751db5ac51fc02733e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1f2f3f3eacd6653ab215c5d2ea70811148d433fc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74e144274af39935b0f410c0ee4d2b91c3730414"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53166.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53166"},{"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":"3fb7394a837740770f0d6b4b30567e60786a63f2"},{"fixed":"16f8e17184b31382076f84751db5ac51fc02733e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"88614876370aac8ad1050ad785a4c095ba17ac11"},{"fixed":"1f2f3f3eacd6653ab215c5d2ea70811148d433fc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"},{"fixed":"74e144274af39935b0f410c0ee4d2b91c3730414"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"d8cce4773c2b23d819baf5abedc62f7b430e8745"},{"last_affected":"8a1fc8d698ac5e5916e3082a0f74450d71f9611f"},{"last_affected":"6d52dfcb2a5db86e346cf51f8fcf2071b8085166"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.175"},{"fixed":"6.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.140"},{"fixed":"6.7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.86"},{"fixed":"6.13"}]}],"versions":["v6.18.35","v6.18.34","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v7.0.12","v7.0.11","v7.0.10","v7.0.9","v7.0.8","v7.0.7","v7.0.6","v7.0.5","v7.0.4","v6.1.174","v6.1.173","v6.6.139","v6.6.138","v6.1.172","v6.1.171","v6.1.170","v6.6.137","v6.12.85","v6.1.169","v6.6.136","v6.12.84","v6.12.83","v6.6.135","v6.12.82","v6.12.81","v6.6.134","v6.1.168","v6.12.80","v6.6.133","v6.1.167","v6.6.132","v6.6.131","v6.12.79","v6.6.130","v6.12.78","v6.12.77","v6.6.129","v6.1.166","v6.12.76","v6.1.165","v6.6.128","v6.12.75","v6.6.127","v6.12.74","v6.1.164","v6.12.73","v6.6.126","v6.1.163","v6.12.72","v6.6.125","v6.12.71","v6.6.124","v6.12.70","v6.12.69","v6.6.123","v6.1.162","v6.12.68","v6.6.122","v6.1.161","v6.12.67","v6.6.121","v6.12.66","v6.1.160","v6.12.65","v6.6.120","v6.12.64","v6.6.119","v6.1.159","v6.12.63","v6.12.62","v6.12.61","v6.12.60","v6.6.118","v6.1.158","v6.12.59","v6.6.117","v6.12.58","v6.6.116","v6.12.57","v6.12.56","v6.6.115","v6.12.55","v6.6.114","v6.1.157","v6.12.54","v6.6.113","v6.12.53","v6.6.112","v6.1.156","v6.12.52","v6.6.111","v6.1.155","v6.12.51","v6.6.110","v6.12.50","v6.6.109","v6.12.49","v6.6.108","v6.1.154","v6.12.48","v6.6.107","v6.1.153","v6.12.47","v6.6.106","v6.1.152","v6.12.46","v6.6.105","v6.1.151","v6.12.45","v6.6.104","v6.1.150","v6.12.44","v6.6.103","v6.1.149","v6.12.43","v6.6.102","v6.1.148","v6.12.42","v6.12.41","v6.6.101","v6.1.147","v6.12.40","v6.6.100","v6.12.39","v6.6.99","v6.1.146","v6.12.38","v6.6.98","v6.1.145","v6.12.37","v6.6.97","v6.1.144","v6.12.36","v6.6.96","v6.1.143","v6.12.35","v6.6.95","v6.1.142","v6.12.34","v6.6.94","v6.1.141","v6.12.33","v6.6.93","v6.12.32","v6.12.31","v6.6.92","v6.1.140","v6.12.30","v6.12.29","v6.6.91","v6.1.139","v6.12.28","v6.6.90","v6.1.138","v6.12.27","v6.6.89","v6.1.137","v6.12.26","v6.1.136","v6.12.25","v6.6.88","v6.1.135","v6.12.24","v6.6.87","v6.1.134","v6.12.23","v6.12.22","v6.6.86","v6.1.133","v6.12.21","v6.6.85","v6.1.132","v6.12.20","v6.6.84","v6.1.131","v6.12.19","v6.6.83","v6.12.18","v6.6.82","v6.1.130","v6.6.81","v6.12.17","v6.1.129","v6.6.80","v6.12.16","v6.6.79","v6.12.15","v6.6.78","v6.1.128","v6.12.14","v6.12.13","v6.6.77","v6.6.76","v6.12.12","v6.6.75","v6.12.11","v6.6.74","v6.1.127","v6.12.10","v6.6.73","v6.1.126","v6.6.72","v6.1.125","v6.12.9","v6.6.71","v6.1.124","v6.6.70","v6.12.8","v6.6.69","v6.1.123","v6.12-rc1","v6.12.7","v6.6.68","v6.1.122","v6.12.6","v6.6.67","v6.1.121","v6.12.5","v6.6.66","v6.1.120","v6.12.4","v6.6.65","v6.1.119","v6.6.64","v6.12","v6.12.3","v6.6.63","v6.12.2","v6.12.1","v6.12-rc7","v6.6.62","v6.1.118","v6.6.61","v6.1.117","v6.12-rc3","v6.6.60","v6.1.116","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.6.59","v6.1.115","v6.12-rc2","v6.6.58",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