P0411 is a general OBDII trouble code, which means that it has the same meaning for the Mazda CX-8 as it would any other car or truck. By definition, the code is letting you know that the ECM has detected incorrect flow in the secondary air injection system.
P0411 in the Mazda CX-8 is not likely to cause the vehicle to break down, but can affect drivability. Any time the check engine light comes on, it’s a good idea to service it as soon possible though.