The qemuMigrationWaitForSpice function in qemu/qemu_migration.c in libvirt before 1.1.3 does not properly enter a monitor when performing seamless SPICE migration, which allows local users to cause a denial of service (NULL pointer dereference and libvirtd crash) by causing domblkstat to be called at the same time as the qemuMonitorGetSpiceMigrationStatus function.
https://bugzilla.redhat.com/show_bug.cgi?id=1077620
http://www.openwall.com/lists/oss-security/2014/03/18/3
http://www.openwall.com/lists/oss-security/2014/03/18/1
http://security.gentoo.org/glsa/glsa-201412-04.xml
http://secunia.com/advisories/60895
http://lists.opensuse.org/opensuse-updates/2014-05/msg00004.html
http://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=484cc321