{"id":17296,"date":"2026-09-05T02:30:57","date_gmt":"2026-09-04T18:30:57","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80792"},"modified":"2026-09-05T02:30:57","modified_gmt":"2026-09-04T18:30:57","slug":"cve-2026-80792","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80792","title":{"rendered":"CVE-2026-80792 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix use-after-f"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipv6: fix use-after-free in ip6_finish_output2()<\/p>\n<p>ip6_finish_output2() caches a pointer to the IPv6 destination<br \/>\naddress (daddr) before invoking lwtunnel_xmit().  The LWT-BPF<br \/>\ntransmit path or other encapsulation operations within<br \/>\nlwtunnel_xmit() can reallocate the skb head, freeing the memory<br \/>\nthat daddr points to.  When lwtunnel_xmit() returns<br \/>\nLWTUNNEL_XMIT_CONTINUE, the function continues to use the stale<br \/>\ndaddr pointer to compute the nexthop and to look up or create the<br \/>\nneighbour entry.  This results in a use-after-free read, which can<br \/>\nleak sensitive kernel data, pollute the neighbour table with<br \/>\narbitrary values, misdirect traffic, or crash the system.<\/p>\n<p>Fix this by re-fetching the IPv6 header and the destination<br \/>\naddress pointer after lwtunnel_xmit() returns<br \/>\nLWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop<br \/>\ncomputation and neighbour lookup operate on valid memory.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ipv6: fix use-after-free in ip6_finish_output2()<\/p>\n<p>ip6_finish_output2() caches a pointer to the IPv6 destination<br \/>\naddress (daddr) bef<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17296","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17296","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=17296"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17296"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17296"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}