Ubuntu Security Update USN-5193-3: X.Org X Server vulnerabilities

[LinuxBot]

USN-5193-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 16.04 ESM. Original advisory details: Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.

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