{"id":7576,"date":"2026-09-04T18:49:36","date_gmt":"2026-09-04T10:49:36","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74562"},"modified":"2026-09-04T18:49:36","modified_gmt":"2026-09-04T10:49:36","slug":"cve-2026-74562","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74562","title":{"rendered":"CVE-2026-74562 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: take nh-&gt;loc"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nexthop: take nh-&gt;lock for f6i_list walks in replace check and notify<\/p>\n<p>fib6_check_nh_list() and __nexthop_replace_notify() walk nh-&gt;f6i_list<br \/>\nduring an RTNL-serialized nexthop replace without holding nh-&gt;lock. IPv6<br \/>\nRTM_NEWROUTE\/RTM_DELROUTE run without RTNL and mutate that list under<br \/>\nnh-&gt;lock (fib6_add_rt2node_nh(), fib6_purge_rt()), so both walks race a<br \/>\nconcurrent route delete that unlinks and frees a fib6_info:<\/p>\n<p>  BUG: KASAN: slab-use-after-free in rt6_fill_node.isra.0 (net\/ipv6\/route.c:5799)<br \/>\n  Read of size 4 at addr ffff888014607e64 by task exploit\/143<br \/>\n   rt6_fill_node.isra.0 (net\/ipv6\/route.c:5799)<br \/>\n   fib6_rt_update (net\/ipv6\/route.c:6412)<br \/>\n   __nexthop_replace_notify (net\/ipv4\/nexthop.c:2542)<br \/>\n   rtm_new_nexthop (net\/ipv4\/nexthop.c:2554)<br \/>\n   rtnetlink_rcv_msg (net\/core\/rtnetlink.c:7076)<\/p>\n<p>  BUG: KASAN: slab-use-after-free in fib6_check_nh_list (net\/ipv4\/nexthop.c:1605)<br \/>\n  Read of size 8 at addr ffff888014a7d068 by task exploit\/142<br \/>\n   fib6_check_nh_list (net\/ipv4\/nexthop.c:1605)<br \/>\n   rtm_new_nexthop (net\/ipv4\/nexthop.c:2575)<br \/>\n   rtnetlink_rcv_msg (net\/core\/rtnetlink.c:7076)<\/p>\n<p>Both walks only read the entries and take no tb6_lock, so protect them<br \/>\nwith nh-&gt;lock; fib6_rt_update() uses gfp_any(), which returns GFP_ATOMIC<br \/>\nunder the lock.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nexthop: take nh-&gt;lock for f6i_list walks in replace check and notify<\/p>\n<p>fib6_check_nh_list() and __nexthop_replace_notify() walk nh-<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7576","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7576","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=7576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}