{"id":21614,"date":"2026-09-12T04:31:25","date_gmt":"2026-09-11T20:31:25","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89692"},"modified":"2026-09-12T04:31:25","modified_gmt":"2026-09-11T20:31:25","slug":"cve-2026-89692","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89692","title":{"rendered":"CVE-2026-89692 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: clear CALLBACK_"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nfsd: clear CALLBACK_RUNNING on failed delegation recall queue<\/p>\n<p>nfsd_break_one_deleg() sets NFSD4_CALLBACK_RUNNING via test_and_set_bit<br \/>\nat entry to serialize recall work, then calls nfsd4_run_cb() to queue<br \/>\nthe recall.  When the queue attempt fails the refcount bump is undone,<br \/>\nbut the RUNNING bit is left set.  The only site that clears the bit is<br \/>\nnfsd41_destroy_cb() (fs\/nfsd\/nfs4callback.c), which runs from the<br \/>\nworkqueue and is therefore unreachable when nothing was queued.<\/p>\n<p>The bit becomes a permanent latch on dp-&gt;dl_recall.cb_flags: every<br \/>\nsubsequent break_lease() on the same delegation hits the early-return<br \/>\nguard in nfsd_break_one_deleg() and silently skips the recall, so the<br \/>\ndelegation is never broken and the conflicting open or lock stalls.<\/p>\n<p>Fix by clearing NFSD4_CALLBACK_RUNNING on the !queued branch alongside<br \/>\nthe refcount_dec.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>nfsd: clear CALLBACK_RUNNING on failed delegation recall queue<\/p>\n<p>nfsd_break_one_deleg() sets NFSD4_CALLBACK_RUNNING via test_and_set<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21614","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21614","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=21614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}