{"id":7182,"date":"2026-09-04T18:49:27","date_gmt":"2026-09-04T10:49:27","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72502"},"modified":"2026-09-04T18:49:27","modified_gmt":"2026-09-04T10:49:27","slug":"cve-2026-72502","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-72502","title":{"rendered":"CVE-2026-72502 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: ipv6: clamp defa"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>tcp: ipv6: clamp default adverting MSS to avoid GSO_BY_FRAGS (0xFFFF)<\/p>\n<p>When MTU is large, ip6_default_advmss() can return IPV6_MAXPLEN (65535).<br \/>\nThis is interpreted by TCP as mss_clamp, allowing the MSS to reach 65535.<\/p>\n<p>However, 0xFFFF is also used as a magic value GSO_BY_FRAGS in the kernel.<br \/>\nIf a TCP packet with gso_size=0xFFFF is passed to skb_segment(), it will<br \/>\nbe mistakenly treated as GSO_BY_FRAGS, leading to a NULL pointer<br \/>\ndereference because local TCP packets do not use frag_list.<\/p>\n<p>Fix this by returning min(IPV6_MAXPLEN, GSO_BY_FRAGS &#8211; 1) (65534) from<br \/>\nip6_default_advmss() when MTU is large.<\/p>\n<p>Also update the stale comment in ip6_default_advmss() which suggested<br \/>\nthat IPV6_MAXPLEN is returned to mean &#8220;any MSS&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>tcp: ipv6: clamp default adverting MSS to avoid GSO_BY_FRAGS (0xFFFF)<\/p>\n<p>When MTU is large, ip6_default_advmss() can return IPV6_MAXP<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7182","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7182","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=7182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}