Red Hat Security Advisory 2016-0013-01 – OpenStack Compute launches and schedules large networks of virtual machines, creating a redundant and scalable cloud computing platform. Compute provides the software, control panels, and APIs required to orchestrate a cloud, including running virtual machine instances and controlling access through users and projects. A vulnerability was discovered in the way OpenStack Compute networking handled security group updates; changes were not applied to already running VM instances. A remote attacker could use this flaw to access running VM instances.