{"id":21262,"date":"2026-09-12T04:30:57","date_gmt":"2026-09-11T20:30:57","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80929"},"modified":"2026-09-12T04:30:57","modified_gmt":"2026-09-11T20:30:57","slug":"cve-2026-80929","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80929","title":{"rendered":"CVE-2026-80929 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nsysctl: move the &#8220;cad"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>sysctl: move the &#8220;cad_pid&#8221; entry from pid_table[] to kern_reboot_table[]<\/p>\n<p>cad_pid is global, and kill_cad_pid() is only used in the root namespace.<\/p>\n<p>However, due to pid_table_root_permissions(), a non-root user can unshare<br \/>\npid\/user namespaces and modify it from the child namespace. This makes no<br \/>\nsense and is simply wrong.<\/p>\n<p>Move it to kern_reboot_table[] where it logically belongs; this ensures<br \/>\nthat only GLOBAL_ROOT_UID can read\/modify this sysctl.<\/p>\n<p>Note that this patch doesn&#8217;t preserve &#8220;#ifdef CONFIG_PROC_SYSCTL&#8221; around<br \/>\nthe &#8220;cad_pid&#8221;; CONFIG_PROC_SYSCTL selects CONFIG_SYSCTL, so it is always<br \/>\nset when kern_reboot_table[] is compiled.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>sysctl: move the &#8220;cad_pid&#8221; entry from pid_table[] to kern_reboot_table[]<\/p>\n<p>cad_pid is global, and kill_cad_pid() is only used in the<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21262","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21262","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=21262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}