{"id":21598,"date":"2026-09-12T04:31:24","date_gmt":"2026-09-11T20:31:24","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89676"},"modified":"2026-09-12T04:31:24","modified_gmt":"2026-09-11T20:31:24","slug":"cve-2026-89676","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89676","title":{"rendered":"CVE-2026-89676 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix stale s2s_c"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nfsd: fix stale s2s_cp_stateids IDR entry for async COPY<\/p>\n<p>For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before<br \/>\ndup_copy_fields(), so the s2s_cp_stateids IDR was pointed at<br \/>\n&amp;u-&gt;copy-&gt;cp_stateid &#8212; memory in the per-rqstp COMPOUND buffer that is<br \/>\nreused by the next request. dup_copy_fields() copies only the value into<br \/>\nasync_copy, so the IDR slot dangled at the transient buffer for the whole<br \/>\nbackground copy. Any IDR walker then dereferences reused request memory:<br \/>\nthe laundromat reads cs_type from it and, if the bytes look like an<br \/>\nexpired NFS4_COPYNOTIFY_STID, follows into<br \/>\nrefcount_dec()\/idr_remove()\/kfree() on garbage; manage_cpntf_state() has<br \/>\nthe same exposure via idr_find().<\/p>\n<p>Duplicate the fields first, then register the stateid on the stable<br \/>\nasync_copy. result-&gt;cb_stateid is unchanged.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nfsd: fix stale s2s_cp_stateids IDR entry for async COPY<\/p>\n<p>For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before<br \/>\ndup_<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21598","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21598","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=21598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}