CVE-2026-89701

In the Linux kernel, the following vulnerability has been resolved:

nfsd: validate nseconds in TIME DELEG decode paths

The xdrgen-based TIME DELEG ACCESS and TIME DELEG MODIFY decode arms store a raw uint32 t nseconds directly into tv nsec without enforcing nseconds < NSEC PER SEC. The legacy nfsd4 decode nfstime4 has this check but the TIME DELEG paths do not. A malformed timespec can propagate through notify change() to disk.

Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB GETATTR path).