{"id":78690,"date":"2026-05-21T15:47:49","date_gmt":"2026-05-21T12:17:49","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-43499-rtmutex-use-waitertask-instead-of-current-in-remove_waiter\/"},"modified":"2026-05-21T15:47:49","modified_gmt":"2026-05-21T12:17:49","slug":"cve-2026-43499-rtmutex-use-waitertask-instead-of-current-in-remove_waiter","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-43499-rtmutex-use-waitertask-instead-of-current-in-remove_waiter\/","title":{"rendered":"CVE-2026-43499 &#8211; rtmutex: Use waiter::task instead of current in remove_waiter()"},"content":{"rendered":"<p>CVE ID :CVE-2026-43499<\/p>\n<p>  Published : May 21, 2026, 12:17 p.m. | 41\u00a0minutes ago<\/p>\n<p>  Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>rtmutex: Use waiter::task instead of current in remove_waiter()<\/p>\n<p>remove_waiter() is used by the slowlock paths, but it is also used for<br \/>\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from<br \/>\nfutex_requeue().<\/p>\n<p>In the latter case waiter::task is not current, but remove_waiter()<br \/>\noperates on current for the dequeue operation. That results in several<br \/>\nproblems:<\/p>\n<p>  1) the rbtree dequeue happens without waiter::task::pi_lock being held<\/p>\n<p>  2) the waiter task&#8217;s pi_blocked_on state is not cleared, which leaves a<br \/>\n     dangling pointer primed for UAF around.<\/p>\n<p>  3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter<br \/>\n     task<\/p>\n<p>Use waiter::task instead of current in all related operations in<br \/>\nremove_waiter() to cure those problems.<\/p>\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the<br \/>\n  \tchangelog ]\n<p>  Severity: 0.0 | NA<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-43499 Published : May 21, 2026, 12:17 p.m. | 41\u00a0minutes ago Description :In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from futex_requeue(). In the &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-78690","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/78690","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=78690"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/78690\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=78690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=78690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=78690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}