CVE-2026-93212
UnknownSummary
A vulnerability in the Linux kernel's NFS server (nfsd) involves a NULL pointer dereference in nfsd_file_net_dispose(). During network teardown, the nn->nfsd_serv pointer may be cleared while the function still attempts to use it, leading to a crash. The fix safely checks the pointer before use.
Risk Assessment
The risk includes a possible NFS server crash (panic) during shutdown or network namespace teardown. This can lead to file service interruptions and system instability.
Recommendation
Apply a Linux kernel update that includes the fix securing the nfsd_serv pointer dereference. For production systems, carefully plan service restarts.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nfsd: guard nfsd_serv deref in nfsd_file_net_dispose nfsd_file_net_dispose() is the consumer side of l->freeme: the nfsd service thread loop calls it to drain entries that the filecache garbage collector and shrinker append via nfsd_file_dispose_list_delayed(). During per-net teardown, nn->nfsd_serv is cleared before the filecache laundrette is shut down, so the service thread can still run a dispose pass that finds more than eight entries on l->freeme and dereferences a NULL svc_serv: nfsd service thread loop nfsd_file_net_dispose(nn) if (!list_empty(&l->freeme)) { ... svc_wake_up(nn->nfsd_serv); /* nn->nfsd_serv == NULL */ } The sibling helper nfsd_file_dispose_list_delayed() already documents this ordering and caches nn->nfsd_serv into a local before testing it for NULL. nfsd_file_net_dispose() was introduced with the same raw svc_wake_up(nn->nfsd_serv) call and never picked up the guard. Fix by loading nn->nfsd_serv into a local svc_serv pointer and only calling svc_wake_up() when it is non-NULL, matching the pattern in nfsd_file_dispose_list_delayed().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS