{"id":5336,"date":"2026-09-04T18:47:45","date_gmt":"2026-09-04T10:47:45","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-68123"},"modified":"2026-09-04T18:47:45","modified_gmt":"2026-09-04T10:47:45","slug":"cve-2026-68123","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-68123","title":{"rendered":"CVE-2026-68123 [CRITICAL] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: fix GSO"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>openvswitch: fix GSO userspace truncation underflow<\/p>\n<p>OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb<br \/>\nlength in OVS_CB(skb)-&gt;cutlen. When a later userspace action segments a<br \/>\nGSO skb, queue_gso_packets() reuses that delta for each smaller segment.<br \/>\nA segment can then reach queue_userspace_packet() with cutlen greater<br \/>\nthan skb-&gt;len, underflowing the length passed to skb_zerocopy().<\/p>\n<p>Store the maximum preserved length instead and bound each consumer<br \/>\nagainst the current skb length. Use U32_MAX as the no-truncation<br \/>\nsentinel so the value remains valid if skb geometry changes before a<br \/>\nconsumer handles it.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>openvswitch: fix GSO userspace truncation underflow<\/p>\n<p>OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb<br \/>\nlength in<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-5336","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/5336","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=5336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}