In the Linux kernel, the following vulnerability has been resolved: NFS/localio: Fix a race in nfs_local_open_fh() Once the clp->cl_uuid.lock has been dropped, another CPU could come in and free the struct nfsd_file that was just added. To prevent that from happening, take the RCU read lock before dropping the spin lock.
https://git.kernel.org/stable/c/fa7ab64f1e2fdc8f2603aab8e0dd20de89cb10d9
https://git.kernel.org/stable/c/185a2f2ddabdcf999823f61de67f86376883920d