The memory resource controller (aka memcg) in the Linux kernel allows local users to cause a denial of service (deadlock) by spawning new processes within a memory-constrained cgroup.
https://bugzilla.redhat.com/show_bug.cgi?id=1198109
http://www.securityfocus.com/bid/74293
http://rhn.redhat.com/errata/RHSA-2016-0068.html
http://rhn.redhat.com/errata/RHSA-2015-2411.html