Matthew Booth from Red Hat reported a vulnerability in Nova instance
resize/migration. By overwriting an ephemeral or root disk with a
malicious image before requesting a resize, an authenticated user may be
able to read arbitrary files from the compute host. Only setups using
libvirt driver with raw storage and setting "use_cow_images = False"
(not default) are affected.
Maintainer(s), please cleanup.
Security, please vote.