{"id":"CVE-2026-46242","summary":"eventpoll: fix ep_remove struct eventpoll / struct file UAF","details":"In the Linux kernel, the following vulnerability has been resolved:\n\neventpoll: fix ep_remove struct eventpoll / struct file UAF\n\nep_remove() (via ep_remove_file()) cleared file-\u003ef_ep under\nfile-\u003ef_lock but then kept using @file inside the critical section\n(is_file_epoll(), hlist_del_rcu() through the head, spin_unlock).\nA concurrent __fput() taking the eventpoll_release() fastpath in\nthat window observed the transient NULL, skipped\neventpoll_release_file() and ran to f_op-\u003erelease / file_free().\n\nFor the epoll-watches-epoll case, f_op-\u003erelease is\nep_eventpoll_release() -\u003e ep_clear_and_put() -\u003e ep_free(), which\nkfree()s the watched struct eventpoll. Its embedded -\u003erefs\nhlist_head is exactly where epi-\u003efllink.pprev points, so the\nsubsequent hlist_del_rcu()'s \"*pprev = next\" scribbles into freed\nkmalloc-192 memory.\n\nIn addition, struct file is SLAB_TYPESAFE_BY_RCU, so the slot\nbacking @file could be recycled by alloc_empty_file() --\nreinitializing f_lock and f_ep -- while ep_remove() is still\nnominally inside that lock. The upshot is an attacker-controllable\nkmem_cache_free() against the wrong slab cache.\n\nPin @file via epi_fget() at the top of ep_remove() and gate the\ncritical section on the pin succeeding. With the pin held @file\ncannot reach refcount zero, which holds __fput() off and\ntransitively keeps the watched struct eventpoll alive across the\nhlist_del_rcu() and the f_lock use, closing both UAFs.\n\nIf the pin fails @file has already reached refcount zero and its\n__fput() is in flight. Because we bailed before clearing f_ep,\nthat path takes the eventpoll_release() slow path into\neventpoll_release_file() and blocks on ep-\u003emtx until the waiter\nside's ep_clear_and_put() drops it. The bailed epi's share of\nep-\u003erefcount stays intact, so the trailing ep_refcount_dec_and_test()\nin ep_clear_and_put() cannot free the eventpoll out from under\neventpoll_release_file(); the orphaned epi is then cleaned up\nthere.\n\nA successful pin also proves we are not racing\neventpoll_release_file() on this epi, so drop the now-redundant\nre-check of epi-\u003edying under f_lock. The cheap lockless\nREAD_ONCE(epi-\u003edying) fast-path bailout stays.","modified":"2026-07-10T04:03:03.220094016Z","published":"2026-05-30T12:13:45.594Z","related":["ALSA-2026:36541","ALSA-2026:36645","openSUSE-SU-2026:10954-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46242.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/07/08/14"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2de4db145b2992da496fea6c51f9839be678ae24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9324de74a3a59b9fde9b62ee45ebaa71458ba2e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6dc643c69311677c574a0f17a3f4d66a5f3744b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ced39b6a8062bac5c18a1c3df85634107eb8664a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef4ca02e95363e78977ca04340d44fe3b4b2b81f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46242.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46242"},{"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":"58c9b016e12855286370dfb704c08498edbc857a"},{"fixed":"2de4db145b2992da496fea6c51f9839be678ae24"},{"fixed":"9324de74a3a59b9fde9b62ee45ebaa71458ba2e5"},{"fixed":"ef4ca02e95363e78977ca04340d44fe3b4b2b81f"},{"fixed":"ced39b6a8062bac5c18a1c3df85634107eb8664a"},{"fixed":"a6dc643c69311677c574a0f17a3f4d66a5f3744b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"f2451def095c1743adcfcb0cb5dadc86034e162a"},{"last_affected":"a1f93804449d13f97dabd4b996817de4bf1ed67a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.209"},{"fixed":"5.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.175"},{"fixed":"6.2"}]}],"versions":["v6.1.174","v5.15.208","v6.1.173","v5.15.207","v6.1.172","v5.15.206","v6.1.171","v5.15.205","v6.1.170","v5.15.204","v5.15.203","v6.1.169","v6.1.168","v5.15.202","v6.1.167","v6.1.166","v6.1.165","v5.15.201","v6.1.164","v6.1.163","v5.15.200","v6.1.162","v5.15.199","v6.1.161","v5.15.198","v5.15.197","v6.1.160","v6.1.159","v6.1.158","v5.15.196","v6.1.157","v5.15.195","v6.1.156","v5.15.194","v6.1.155","v6.1.154","v5.15.193","v6.1.153","v6.1.152","v6.1.151","v5.15.192","v6.1.150","v5.15.191","v6.1.149","v5.15.190","v6.1.148","v5.15.189","v6.1.147","v6.1.146","v6.1.145","v5.15.188","v6.1.144","v5.15.187","v6.1.143","v5.15.186","v6.1.142","v6.1.141","v5.15.185","v6.1.140","v5.15.184","v6.1.139","v5.15.183","v6.1.138","v5.15.182","v6.1.137","v5.15.181","v6.1.136","v6.1.135","v5.15.180","v6.1.134","v6.1.133","v5.15.179","v6.1.132","v6.1.131","v6.1.130","v5.15.178","v6.1.129","v6.1.128","v6.1.127","v5.15.177","v6.1.126","v5.15.176","v6.1.125","v6.1.124","v6.1.123","v5.15.175","v6.1.122","v6.1.121","v6.1.120","v5.15.174","v6.1.119","v5.15.173","v6.1.118","v6.1.117","v5.15.172","v6.1.116","v5.15.171","v6.1.115","v5.15.170","v6.1.114","v5.15.169","v6.1.113","v5.15.168","v6.1.112","v5.15.167","v6.1.111","v6.1.110","v6.1.109","v5.15.166","v6.1.108","v6.1.107","v5.15.165","v6.1.106","v6.1.105","v5.15.164","v6.1.104","v6.1.103","v6.1.102","v6.1.101","v5.15.163","v6.1.100","v6.1.99","v5.15.162","v6.1.98","v6.1.97","v6.1.96","v5.15.161","v6.1.95","v6.1.94","v6.1.93","v5.15.160","v6.1.92","v6.1.91","v5.15.159","v6.1.90","v5.15.158","v6.1.89","v5.15.157","v6.1.88","v6.1.87","v5.15.156","v6.1.86","v5.15.155","v6.1.85","v5.15.154","v6.1.84","v5.15.153","v6.1.83","v5.15.152","v6.1.82","v6.1.81","v5.15.151","v6.1.80","v5.15.150","v6.1.79","v5.15.149","v6.1.78","v5.15.148","v6.1.77","v6.1.76","v6.1.75","v6.1.74","v5.15.147","v6.1.73","v6.1.72","v5.15.146","v6.1.71","v6.1.70","v5.15.145","v6.1.69","v5.15.144","v6.1.68","v5.15.143","v6.1.67","v5.15.142","v6.1.66","v6.1.65","v5.15.141","v6.1.64","v5.15.140","v6.1.63","v5.15.139","v6.1.62","v5.15.138","v5.15.137","v6.1.61","v6.1.60","v6.1.59","v5.15.136","v6.1.58","v5.15.135","v6.1.57","v6.1.56","v5.15.134","v6.1.55","v5.15.133","v6.1.54","v5.15.132","v6.1.53","v5.15.131","v6.1.52","v5.15.130","v6.1.51","v5.15.129","v6.1.50","v5.15.128","v6.1.49","v6.1.48","v5.15.127","v6.1.47","v6.1.46","v6.1.45","v5.15.126","v5.15.125","v6.1.44","v6.1.43","v5.15.124","v6.1.42","v5.15.123","v6.1.41","v5.15.122","v5.15.121","v6.1.40","v6.1.39","v5.15.120","v6.1.38","v6.1.37","v5.15.119","v6.1.36","v6.1.35","v5.15.118","v6.1.34","v5.15.117","v6.1.33","v5.15.116","v6.1.32","v5.15.115","v6.1.31","v5.15.114","v6.1.30","v5.15.113","v5.15.112","v6.1.29","v6.1.28","v5.15.111","v6.1.27","v5.15.110","v6.1.26","v5.15.109","v6.1.25","v5.15.108","v6.1.24","v5.15.107","v6.1.23","v5.15.106","v6.1.22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