{"id":11271,"date":"2026-09-04T18:53:07","date_gmt":"2026-09-04T10:53:07","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74701"},"modified":"2026-09-04T18:53:07","modified_gmt":"2026-09-04T10:53:07","slug":"cve-2026-74701","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74701","title":{"rendered":"CVE-2026-74701 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnet\/openvswitch: chec"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net\/openvswitch: check Ethernet header length in key_extract()<\/p>\n<p>When a packet arrives on an ARPHRD_NONE device (e.g. TUN),<br \/>\novs_flow_key_extract() trusts the user-provided skb-&gt;protocol field: if<br \/>\nit is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and<br \/>\nkey_extract() is called without ensuring the skb has ETH_HLEN (14) bytes<br \/>\nof linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes<br \/>\nfor MAC addresses and parse_ethertype() pulls 2 more, either of which<br \/>\ntriggers a kernel BUG in __skb_pull() when the linear area is too small.<\/p>\n<p>  kernel BUG at include\/linux\/skbuff.h:2848!<br \/>\n  RIP: 0010:key_extract+0xa7e\/0xd90 net\/openvswitch\/flow.c:933<br \/>\n  ovs_flow_key_extract+0x419\/0xa70<br \/>\n  ovs_vport_receive+0x222\/0x390<br \/>\n  netdev_frame_hook+0x3e0\/0x630<br \/>\n  tun_get_user+0x2d0c\/0x38e0<\/p>\n<p>Fixed by calling check_header() in key_extract() before accessing the<br \/>\nEthernet header.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>net\/openvswitch: check Ethernet header length in key_extract()<\/p>\n<p>When a packet arrives on an ARPHRD_NONE device (e.g. TUN),<br \/>\novs_flow<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11271","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11271","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=11271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}