This kernel update is based on upstream 4.4.59 and fixes at least the following security issue:
The xfrmreplayverifylen function in net/xfrm/xfrmuser.c in the Linux kernel through 4.10.6 does not validate certain size data after an XFRMMSGNEWAE update, which allows local users to obtain root privileges or cause a denial of service (heap-based out-of-bounds access) by leveraging the CAPNETADMIN capability (CVE-2017-7184).
For other upstream fixes in this update, see the referenced changelogs.