Ubuntu Security Notice 6073-7 - USN-6073-2 fixed a vulnerability in Glance_store. Unfortunately the update introduced a regression with detaching volumes. The security fix has been removed pending further investigation. Jan Wasilewski and Gorka Eguileor discovered that Glance_store incorrectly handled deleted volume attachments. An authenticated user or attacker could possibly use this issue to gain access to sensitive information.
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