{"id":14955,"date":"2026-09-04T19:02:19","date_gmt":"2026-09-04T11:02:19","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-63917"},"modified":"2026-09-04T19:02:19","modified_gmt":"2026-09-04T11:02:19","slug":"cve-2026-63917","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-63917","title":{"rendered":"CVE-2026-63917 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nip6: vti: Use ip6_tnl"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ip6: vti: Use ip6_tnl.net in vti6_changelink().<\/p>\n<p>ip netns add ns1<br \/>\nip netns add ns2<br \/>\nip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7<br \/>\nip -n ns1 link set vti6_test netns ns2<br \/>\nip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9<br \/>\nip netns del ns2<br \/>\nip netns del ns1<br \/>\n[  132.495484] &#8212;&#8212;&#8212;&#8212;[ cut here ]&#8212;&#8212;&#8212;&#8212;<br \/>\n[  132.497609] kernel BUG at net\/core\/dev.c:12376!<\/p>\n<p>Commit 61220ab34948 (&#8220;vti6: Enable namespace changing&#8221;) dropped<br \/>\nNETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then<br \/>\nmove through IFLA_NET_NS_FD. After the move dev_net(dev) points<br \/>\nat the new netns while t-&gt;net stays at the creation netns.<\/p>\n<p>vti6_changelink() and vti6_update() still use dev_net(dev) and<br \/>\ndev_net(t-&gt;dev). They unlink from one per netns hash and relink<br \/>\ninto another. The creation netns is left with a stale entry.<br \/>\ncleanup_net() of that netns later walks freed memory.<\/p>\n<p>Reachable from an unprivileged user namespace (unshare &#8211;user<br \/>\n&#8211;map-root-user &#8211;net). Cross tenant scope on container hosts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ip6: vti: Use ip6_tnl.net in vti6_changelink().<\/p>\n<p>ip netns add ns1<br \/>\nip netns add ns2<br \/>\nip -n ns1 link add vti6_test type vti6 remote ::<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14955","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14955","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=14955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}