{"id":"CVE-2026-43499","summary":"rtmutex: Use waiter::task instead of current in remove_waiter()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtmutex: Use waiter::task instead of current in remove_waiter()\n\nremove_waiter() is used by the slowlock paths, but it is also used for\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from\nfutex_requeue().\n\nIn the latter case waiter::task is not current, but remove_waiter()\noperates on current for the dequeue operation. That results in several\nproblems:\n\n  1) the rbtree dequeue happens without waiter::task::pi_lock being held\n\n  2) the waiter task's pi_blocked_on state is not cleared, which leaves a\n     dangling pointer primed for UAF around.\n\n  3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter\n     task\n\nUse waiter::task instead of current in all related operations in\nremove_waiter() to cure those problems.\n\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the\n  \tchangelog ]","modified":"2026-06-11T12:29:12.526564861Z","published":"2026-05-21T12:17:49.281Z","related":["SUSE-SU-2026:22048-1","SUSE-SU-2026:2310-1","SUSE-SU-2026:2317-1","SUSE-SU-2026:2331-1","SUSE-SU-2026:2332-1","openSUSE-SU-2026:10859-1","openSUSE-SU-2026:20912-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43499.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166"},{"type":"WEB","url":"https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43499.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43499"},{"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":"8161239a8bcce9ad6b537c04a1fa3b5c68bae693"},{"fixed":"d8cce4773c2b23d819baf5abedc62f7b430e8745"},{"fixed":"8a1fc8d698ac5e5916e3082a0f74450d71f9611f"},{"fixed":"6d52dfcb2a5db86e346cf51f8fcf2071b8085166"},{"fixed":"3fb7394a837740770f0d6b4b30567e60786a63f2"},{"fixed":"88614876370aac8ad1050ad785a4c095ba17ac11"},{"fixed":"3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43499.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.39"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43499.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}