GHSA-Q3RW-WCJ6-8CJF OpenStack Cinder LVMVolumeDriver does not zero deleted snapshots

The clearvolume function in LVMVolumeDriver driver in OpenStack Cinder 2013.1.1 through 2013.1.2 does not properly clear data when deleting a snapshot, which allows local users to obtain sensitive information via unspecified vectors...