If users haven't configured guest agent then qemuAgentCommand() will dereference a NULL 'mon' pointer.
A remote user able to issue commands to libvirt daemon could use this flaw to crash libvirtd.
This issue was discovered by Alex Jia of Red Hat.
Not vulnerable. This issue did not affect the versions of libvirt as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6.
Created libvirt tracking bugs for this issue:
Affects: fedora-all [bug 986406]