{"id":7055,"date":"2026-09-04T18:49:24","date_gmt":"2026-09-04T10:49:24","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72408"},"modified":"2026-09-04T18:49:24","modified_gmt":"2026-09-04T10:49:24","slug":"cve-2026-72408","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72408","title":{"rendered":"CVE-2026-72408 [CRITICAL] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: gate GRO hint"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>geneve: gate GRO hint in geneve_gro_complete() on gs-&gt;gro_hint<\/p>\n<p>geneve_gro_receive() reads the GRO hint through geneve_sk_gro_hint_off(),<br \/>\nwhich honours it only when the socket enabled IFLA_GENEVE_GRO_HINT<br \/>\n(gs-&gt;gro_hint). geneve_gro_complete() instead calls the low-level<br \/>\ngeneve_opt_gro_hint_off() and acts on the hint unconditionally.<\/p>\n<p>On a tunnel without the hint, receive aggregates the frames as plain<br \/>\nETH_P_TEB while complete still honours an attacker-supplied hint option: it<br \/>\ninflates gh_len by gro_hint-&gt;nested_hdr_len (u8) and redirects the dispatch<br \/>\ntype, so the inner gro_complete handler runs at nhoff + gh_len, an offset<br \/>\nreceive never pulled nor validated, reading out of bounds of the skb head:<\/p>\n<p>  BUG: KASAN: slab-out-of-bounds in ipv6_gro_complete (net\/ipv6\/ip6_offload.c:196)<br \/>\n  Read of size 1 at addr ffff88800fe91980 by task exploit\/153<br \/>\n   ipv6_gro_complete (net\/ipv6\/ip6_offload.c:196)<br \/>\n   geneve_gro_complete (drivers\/net\/geneve.c:965)<br \/>\n   udp_gro_complete (net\/ipv4\/udp_offload.c:940)<br \/>\n   inet_gro_complete (net\/ipv4\/af_inet.c:1621)<br \/>\n   __gro_flush (net\/core\/gro.c:306)<\/p>\n<p>Gate the complete path on gs-&gt;gro_hint too via geneve_sk_gro_hint_off(), so<br \/>\nboth paths agree. Tunnels that enable the hint are unaffected.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>geneve: gate GRO hint in geneve_gro_complete() on gs-&gt;gro_hint<\/p>\n<p>geneve_gro_receive() reads the GRO hint through geneve_sk_gro_hint_<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7055","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7055","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=7055"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7055"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}