{"id":25714,"date":"2026-09-18T04:31:46","date_gmt":"2026-09-17T20:31:46","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-90305"},"modified":"2026-09-18T04:31:46","modified_gmt":"2026-09-17T20:31:46","slug":"cve-2026-90305","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-90305","title":{"rendered":"CVE-2026-90305 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9483\/1: select H"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ARM: 9483\/1: select HAVE_POSIX_CPU_TIMERS_TASK_WORK<\/p>\n<p>Commit c6e61c06d606 (&#8220;ARM: 9463\/1: Allow to enable RT&#8221;) enabled PREEMPT_RT<br \/>\non ARM but did not select HAVE_POSIX_CPU_TIMERS_TASK_WORK. This leaves<br \/>\nCONFIG_POSIX_CPU_TIMERS_TASK_WORK disabled, so CPU timers expire in hard<br \/>\nIRQ context.<\/p>\n<p>On PREEMPT_RT this makes run_posix_cpu_timers() take the sleeping<br \/>\nsighand-&gt;siglock:<\/p>\n<p>  BUG: sleeping function called from invalid context at spinlock_rt.c:48<br \/>\n    rt_spin_lock from lock_task_sighand<br \/>\n    lock_task_sighand from run_posix_cpu_timers<br \/>\n    run_posix_cpu_timers from update_process_times<\/p>\n<p>ARM handles TIF_NOTIFY_RESUME on all return-to-user paths, including v7-M.<br \/>\nARM32 KVM host support was removed by commit 541ad0150ca4 (&#8220;arm: Remove<br \/>\n32bit KVM host support&#8221;), so the select need not be conditional on KVM.<\/p>\n<p>Select it to defer POSIX CPU timer expiry to task context.<\/p>\n<p>Reproduced with setrlimit(RLIMIT_CPU, &#8230;) and a busy loop. The same path<br \/>\nis used by setitimer(ITIMER_PROF or ITIMER_VIRTUAL) and POSIX CPU timers<br \/>\ncreated with timer_create().<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ARM: 9483\/1: select HAVE_POSIX_CPU_TIMERS_TASK_WORK<\/p>\n<p>Commit c6e61c06d606 (&#8220;ARM: 9463\/1: Allow to enable RT&#8221;) enabled PREEMPT_RT<br \/>\non <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25714","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25714","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}