{"id":33324,"date":"2026-10-06T20:31:46","date_gmt":"2026-10-06T12:31:46","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98255"},"modified":"2026-10-06T20:31:46","modified_gmt":"2026-10-06T12:31:46","slug":"cve-2026-98255","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98255","title":{"rendered":"CVE-2026-98255 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: exclude old ACKs"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>tcp: exclude old ACKs from tcp fast path<\/p>\n<p>Exclude old ACKs before SND.UNA from the tcp fast path<br \/>\nas well as ACKs after SND.NXT.<\/p>\n<p>Such ACKs will fall through to the slow path, where tcp_ack()<br \/>\nperforms the appropriate validation and challenge ACK handling<br \/>\naccording to RFC5961 and Commit 3d501dd326fb1c7 (&#8220;tcp: do not<br \/>\naccept ACK of bytes we never sent&#8221;).<\/p>\n<p>This prevents old ACKs from being accepted<br \/>\nor modifying connection state as part of the fast path before<br \/>\nappropriate ACK validation is applied.<br \/>\nIn particular, this prevents payload carried by a segment with<br \/>\nan excessively old ACK from advancing RCV.NXT before the ACK<br \/>\nis rejected.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>tcp: exclude old ACKs from tcp fast path<\/p>\n<p>Exclude old ACKs before SND.UNA from the tcp fast path<br \/>\nas well as ACKs after SND.NXT.<\/p>\n<p>Su<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33324","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33324","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=33324"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33324"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}