{"id":21525,"date":"2026-09-12T04:31:18","date_gmt":"2026-09-11T20:31:18","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89603"},"modified":"2026-09-12T04:31:18","modified_gmt":"2026-09-11T20:31:18","slug":"cve-2026-89603","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89603","title":{"rendered":"CVE-2026-89603 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nentry: Fix seccomp by"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>entry: Fix seccomp bypass after ptrace with TSYNC<\/p>\n<p>Sashiko review pointed out the following issue.<\/p>\n<p>If a thread is stopped in syscall_trace_enter() for ptrace, another<br \/>\nthread can install a seccomp filter with SECCOMP_FILTER_FLAG_TSYNC<br \/>\n(e.g., via seccomp_attach_filter()). This will successfully set<br \/>\nSYSCALL_WORK_SECCOMP on the stopped thread, but syscall_trace_enter()<br \/>\nevaluates a cached &#8216;work&#8217; variable sampled on entry. Consequently,<br \/>\nthe subsequent check for SYSCALL_WORK_SECCOMP misses the newly<br \/>\nassigned flag, and the filter is silently bypassed.<\/p>\n<p>This race condition could allow an unprivileged process to execute<br \/>\na prohibited system call (e.g., execve) that the newly installed filter<br \/>\nwas intended to block, especially since the tracer might have modified<br \/>\nthe system call number during the ptrace stop.<\/p>\n<p>Fix this by re-reading the syscall_work flags after ptrace handling,<br \/>\nso that any new SYSCALL_WORK_SECCOMP flag set by another thread via<br \/>\nTSYNC during the ptrace stop is observed before the subsequent<br \/>\nseccomp check.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>entry: Fix seccomp bypass after ptrace with TSYNC<\/p>\n<p>Sashiko review pointed out the following issue.<\/p>\n<p>If a thread is stopped in sysca<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21525","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21525","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=21525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}