In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ipv6: mcast: use rcu_assign_pointer() for __rcu list updates<\/p>\n
Several places in net\/ipv6\/mcast.c update RCU-protected lists
\n(np->ipv6_mc_list, idev->mc_list, idev->mc_tomb) using direct pointer
\nassignments instead of rcu_assign_pointer():<\/p>\n
1. In __ipv6_dev_mc_dec(), unlinking a group from idev->mc_list did:
\n *map = ma->next;
\n without rcu_assign_pointer() while concurrent readers traverse
\n idev->mc_list locklessly under rcu_read_lock().
\n2. In ipv6_sock_mc_drop() and __ipv6_sock_mc_close(), unlinking a group
\n from np->ipv6_mc_list directly assigned *lnk = mc_lst->next and
\n np->ipv6_mc_list = mc_lst->next without rcu_assign_pointer(), racing
\n with lockless readers in inet6_mc_check().
\n3. In __ipv6_sock_mc_join(), mc_lst->next was initialized to
\n np->ipv6_mc_list via raw assignment before publishing mc_lst.
\n4. In mld_del_delrec() and __ipv6_dev_mc_inc(), __rcu source pointers
\n passed into rcu_assign_pointer() lacked explicit dereference helpers.<\/p>\n
Fix these by consistently using rcu_assign_pointer() along with
\nmc_dereference() \/ sock_dereference().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ipv6: mcast: use rcu_assign_pointer() for __rcu list updates<\/p>\n
Several places in net\/ipv6\/mcast.c update RCU-protected lists
\n(np->ip<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29254","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29254","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=29254"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29254"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}