fs/nfs/nfs4proc.c in the NFS client in the Linux kernel before 4.2.2 does not properly initialize memory for migration recovery operations, which allows remote NFS servers to cause a denial of service (NULL pointer dereference and panic) via crafted network traffic.
http://rhn.redhat.com/errata/RHSA-2016-2574.html
http://rhn.redhat.com/errata/RHSA-2016-2584.html
https://bugzilla.redhat.com/show_bug.cgi?id=1295802
https://github.com/torvalds/linux/commit/18e3b739fdc826481c6a1335ce0c5b19b3d415da
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.2.2