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.
http://rhn.redhat.com/errata/RHSA-2015-0864.html
http://rhn.redhat.com/errata/RHSA-2015-2152.html
http://rhn.redhat.com/errata/RHSA-2015-2411.html