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USN-2451-1: cgmanager vulnerability

6 January 2015

cgmanager could be made to expose sensitive information or devices to containers running on the system.




Serge Hallyn discovered that cgmanager did not consistently enforce
proper nesting when modifying cgroup properties. A local attacker in a
privileged container could use this to set cgroup values for all cgroups.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.10
Ubuntu 14.04

After a standard system update you need to reboot your computer to make
all the necessary changes.