USN-5614-2: Wayland vulnerability

USN-5614-2: Wayland vulnerability

USN-5614-1 fixed a vulnerability in Wayland. This update
provides the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that Wayland incorrectly handled reference counting
certain objects. An attacker could use this issue to cause Wayland to
crash, resulting in a denial of service, or possibly execute arbitrary
code.
Source: USN-5614-2: Wayland vulnerability