CVE-2026-89699

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

nfsd: validate symlink target length in NFSv4 CREATE

nfsd4_decode_create() accepts an unbounded cr_datalen from the wire for

NF4LNK symlink targets, allowing a client to force a kmalloc of up to

the maximum RPC payload size (several MiB) per COMPOUND op that persists

until compound teardown. The VFS rejects oversized targets with

ENAMETOOLONG, but the allocation has already occurred.

Reject cr_datalen == 0 early with nfserr_inval and cr_datalen greater

than NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the

allocation.