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USN-7085-1 fixed a vulnerability in X.Org. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
Original advisory details:
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain memory operations in the X Keyboard Extension. An attacker could
use this issue to cause the X Server to crash, leading to a denial of
service, or possibly execute arbitrary code.