libvirt 1.1.0 and 1.1.1 allows local users to cause a denial of service (memory consumption) via a large number of domain migrate parameters in certain RPC calls in (1) daemon/remote.c and (2) remote/remote_driver.c.
http://www.mail-archive.com/libvir-list%40redhat.com/msg83332.html
http://security.gentoo.org/glsa/glsa-201412-04.xml