A control valve (20) for a device for variably setting the control times of gas exchange valves (110, 111) of an internal combustion engine (100). Two working ports (A, B) and one supply port (24) are formed on an outer casing surface of a valve housing (22) of the control valve (20), the working ports (A, B) are arranged directly adjacent one another, and the supply port adjoins them. Further, two pressure medium ducts (40, 41) are formed on the control piston (30), at least one of the pressure medium ducts (40, 41) is embodied so that it is not rotationally symmetric with respect to a longitudinal axis (36) of the control piston (30).