Ubuntu Security Update USN-4653-2: containerd vulnerability

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containerd packages from USN-4653-1 were reverted in order to fix a dependency issue with the docker package. This new update fixes the same issues as the previous one. We apologize for the inconvenience. Original advisory details: It was discovered that access controls for the shim’s API socket did not restrict access to the abstract unix domain socket in some cases. An attacker could use this vulnerability to run containers with elevated privileges.

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