No only VW so far.
What happened is that someone found a way to put a extra piece of program in the engine management computer.
This program is very clever, it recognizes when the engine is going through an emission test . It can do this as the engine runs to a specific test pattern when it is being emission tested. As soon as the computer recognizes the test starting it switches the engine to a special 'clean' run program. As soon as the test stops the engine goes back to normal.
If you were a VW engineer & you knew your programmers had developed this , would you want other car makers to know and throw away your advantage? I think not. Of course it may be that an outside programmer has developed this and sold it to other car makers, but so far only VWs have been found to have it.
I am wondering how this will effect the London 'Low Emission Zone' ,only cars that have been certified as 'Low Emission' are permitted into the zone. At the moment VW are permitted but will that change?