In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
xfrm: use hlist_del_init_rcu for state_cache and state_cache_input<\/p>\n
Commit 14acf9652e56 (“xfrm: defensively unhash xfrm_state lists in
\n__xfrm_state_delete”) converted bydst\/bysrc\/byseq\/byspi from
\nhlist_del_rcu() to hlist_del_init_rcu() so that a second
\n__xfrm_state_delete() on the same object becomes a no-op rather than a
\nwrite through LIST_POISON pprev. It missed state_cache and
\nstate_cache_input, which kept hlist_del_rcu():<\/p>\n
– hlist_del_rcu() leaves pprev = LIST_POISON2 (non-NULL), so
\n hlist_unhashed() returns false.
\n– hlist_del_init_rcu() leaves pprev = NULL, so hlist_unhashed()
\n returns true.<\/p>\n
A second __xfrm_state_delete() therefore enters __hlist_del() on the
\nalready-deleted state_cache\/state_cache_input nodes and does
\nWRITE_ONCE(*pprev, next) through LIST_POISON2 \u2014 a write use-after-free
\nonce the slab is reused. The corruption can in turn cause a subsequent
\nhlist_for_each_entry_rcu traversal to follow a dangling next pointer,
\nproducing the read use-after-free reported in xfrm_input_state_lookup().<\/p>\n
Switch state_cache and state_cache_input to hlist_del_init_rcu() to
\nmatch the other four lists, closing the write use-after-free and, with
\nit, the read use-after-free it spawns.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
xfrm: use hlist_del_init_rcu for state_cache and state_cache_input<\/p>\n
Commit 14acf9652e56 (“xfrm: defensively unhash xfrm_state lists<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33299","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33299","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=33299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}