CVE-2013-6437
The libvirt driver in OpenStack Compute (Nova) before 2013.2.2 and icehouse before icehouse-2 allows remote authenticated users to cause a denial of service (disk consumption) by creating and deleting instances with unique os_type settings, which triggers the creation of a new ephemeral disk backing file.
Date published : 2014-03-06
https://bugs.launchpad.net/nova/+bug/1253980
http://lists.openstack.org/pipermail/openstack-announce/2013-December/000179.html