{"id":7077,"date":"2026-09-04T18:49:24","date_gmt":"2026-09-04T10:49:24","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72421"},"modified":"2026-09-04T18:49:24","modified_gmt":"2026-09-04T10:49:24","slug":"cve-2026-72421","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72421","title":{"rendered":"CVE-2026-72421 [CRITICAL] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: Don&#8217;t igno"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipv4: fib: Don&#8217;t ignore error route in local\/main tables.<\/p>\n<p>When CONFIG_IP_MULTIPLE_TABLES is enabled but no rule is added,<br \/>\nfib_lookup() performs route lookup directly on two tables.<\/p>\n<p>Since the first lookup does not properly bail out, the result<br \/>\nof an error route in the merged local\/main table could be<br \/>\noverwritten by another route in the default table:<\/p>\n<p>  # unshare -n<br \/>\n  # ip link set lo up<br \/>\n  # ip route add 192.168.0.0\/24 dev lo table 253<br \/>\n  # ip route add unreachable 192.168.0.0\/24<br \/>\n  # ip route get 192.168.0.1<br \/>\n  192.168.0.1 dev lo table default uid 0<br \/>\n      cache <\/p>\n<p>Once a random rule is added, the error route is respected:<\/p>\n<p>  # ip rule add table 0<br \/>\n  # ip rule del table 0<br \/>\n  # ip route get 192.168.0.1<br \/>\n  RTNETLINK answers: No route to host<\/p>\n<p>Let&#8217;s fix the inconsistent behaviour.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipv4: fib: Don&#8217;t ignore error route in local\/main tables.<\/p>\n<p>When CONFIG_IP_MULTIPLE_TABLES is enabled but no rule is added,<br \/>\nfib_look<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7077","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7077","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=7077"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7077"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7077"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}