UBUNTU-CVE-2026-89692

In the Linux kernel, the following vulnerability has been resolved: nfsd: clear CALLBACKRUNNING on failed delegation recall queue nfsdbreakonedeleg sets NFSD4CALLBACKRUNNING via testandsetbit at entry to serialize recall work, then calls nfsd4runcb to queue the recall. When the queue attempt fail...

CVE-2026-89692

CVE-2026-89692 is a denial-of-service vulnerability in the Linux kernel's nfsd (NFS daemon). When a delegation recall queue attempt fails, the NFSD4_CALLBACK_RUNNING flag is left permanently set because the only code path that clears it (nfsd41_destroy_cb) is unreachable in that scenario. This ca...