This image is build similar to the official one under https://github.com/kubernetes/dns/blob/master/images/dnsmasq/Dockerfile.cross but we are not aware of any changes in official repository as well as version number compatible with https://github.com/kubernetes/dns/releases
This image is based on our ubuntu:16.04
which has 2.75
as the latest version in package repository
of dnsmasq
and the official image is using latest version from http://www.thekelleys.org.uk/dnsmasq/.