{"id":11921,"date":"2026-09-04T18:53:57","date_gmt":"2026-09-04T10:53:57","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74739"},"modified":"2026-09-04T18:53:57","modified_gmt":"2026-09-04T10:53:57","slug":"cve-2026-74739","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74739","title":{"rendered":"CVE-2026-74739 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnet\/sched: cls_u32: s"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net\/sched: cls_u32: skip hash tables in u32_bind_class()<\/p>\n<p>u32_walk() enumerates both struct tc_u_hnode and struct tc_u_knode<br \/>\nthrough the walker callback. u32_bind_class() unconditionally casts the<br \/>\npassed fh to tc_u_knode and accesses &amp;n-&gt;res, so when fh is actually a<br \/>\ntc_u_hnode, which has no tcf_result member, this results in a<br \/>\nslab-out-of-bounds read of res-&gt;classid in tc_cls_bind_class().<\/p>\n<p>The issue can be reproduced with the following commands:<\/p>\n<p>    tc qdisc add dev lo root handle 1: hfsc<br \/>\n    tc class add dev lo parent 1: classid 1:1 hfsc sc rate 1000kbit<br \/>\n    tc filter add dev lo parent 1:1 protocol ip prio 1 u32 match u32 0 0 flowid 1:1<br \/>\n    tc class add dev lo parent 1: classid 1:2 hfsc sc rate 2000kbit<\/p>\n<p>Fix this by skipping hash tables via the TC_U32_KEY(handle) check.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net\/sched: cls_u32: skip hash tables in u32_bind_class()<\/p>\n<p>u32_walk() enumerates both struct tc_u_hnode and struct tc_u_knode<br \/>\nthroug<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11921","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11921","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=11921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}