{"id":21606,"date":"2026-09-12T04:31:24","date_gmt":"2026-09-11T20:31:24","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89684"},"modified":"2026-09-12T04:31:24","modified_gmt":"2026-09-11T20:31:24","slug":"cve-2026-89684","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89684","title":{"rendered":"CVE-2026-89684 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix cpntf publi"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nfsd: fix cpntf publish race in nfs4_init_cp_state<\/p>\n<p>nfs4_alloc_init_cpntf_state() published the new cpntf entry into the<br \/>\ns2s_cp_stateids IDR (with cs_type set) in one s2s_cp_lock section, then<br \/>\ntook the lock again to list_add() it onto p_stid-&gt;sc_cp_list. In the gap<br \/>\nthe entry is reachable by so_id but cp_list is still {NULL,NULL} from<br \/>\nkzalloc. A racing OFFLOAD_CANCEL (so_id is echoed to the client as<br \/>\ncnr_stateid, so any NFSv4.2 client can drive it) reaches<br \/>\nmanage_cpntf_state() -&gt; _free_cpntf_state_locked() and does list_del() on<br \/>\nthe zeroed list_head, oopsing the server.<\/p>\n<p>Fold the cs_type assignment and the list_add() into the same critical<br \/>\nsection as idr_alloc_cyclic(), so a concurrent lookup either misses the<br \/>\nentry or sees a fully linked cp_list. INIT_LIST_HEAD() the entry after<br \/>\nallocation and switch _free_cpntf_state_locked() to list_del_init() so a<br \/>\nstale unlink is a no-op. nfs4_init_copy_state() passes NULL p_stid and<br \/>\nskips the list_add, preserving NFS4_COPY_STID semantics.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nfsd: fix cpntf publish race in nfs4_init_cp_state<\/p>\n<p>nfs4_alloc_init_cpntf_state() published the new cpntf entry into the<br \/>\ns2s_cp_sta<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21606","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21606","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=21606"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21606"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}