In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sunrpc: defer rq_argp and rq_resp free until after RCU grace period<\/p>\n
svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously
\nvia kfree(), but defers the rqstp struct free via kfree_rcu(). After
\nsvc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is
\na window where RCU readers that started before list_del_rcu() can still
\ntraverse the thread list and find the rqstp. These readers (e.g.
\nnfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has
\nalready been freed \u2014 a use-after-free.<\/p>\n
Fix this by moving the kfree of rq_argp and rq_resp into an explicit
\ncall_rcu() callback alongside the struct free. Resources not accessed
\nby RCU readers (bvec, buffer pages, scratch folio, auth_data) remain
\nsynchronously freed.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sunrpc: defer rq_argp and rq_resp free until after RCU grace period<\/p>\n
svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchr<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21467","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21467","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=21467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}