In setForceHideNonSystemOverlayWindowIfNeeded of WindowState.java, there is a possible way for message content to be visible on the screensaver while lock screen visibility settings are restricted by the user due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.