Ubuntu Security Notice 2436-2 – USN-2436-1 fixed vulnerabilities in the X.Org X server. Since publication, additional fixes have been made available for these issues. This update adds the additional fixes. Ilja van Sprundel discovered a multitude of security issues in the X.Org X server. An attacker able to connect to an X server, either locally or remotely, could use these issues to cause the X server to crash or execute arbitrary code resulting in possible privilege escalation. Various other issues were also addressed.