It was discovered that the GNOME Shell incorrectly handled certain keyboard inputs. An attacker could possibly use this issue to invoke keyboard shortcuts, and potentially other actions while the workstation was locked.
{ "availability": "No subscription required", "binaries": [ { "binary_version": "3.28.3+git20190124-0ubuntu18.04.2", "binary_name": "gnome-shell" }, { "binary_version": "3.28.3+git20190124-0ubuntu18.04.2", "binary_name": "gnome-shell-common" }, { "binary_version": "3.28.3+git20190124-0ubuntu18.04.2", "binary_name": "gnome-shell-dbgsym" } ] }