You can check the release notes (readme.txt) for the version of CMOD you're using, and towards the end of the document, it'll show you which versions CMOD was tested with. As long as you're using a version of DB2 newer than what was tested with, it's presumed to work -- and of course, it will be supported.
In the absence of any specific advice from IBM (you could open a PMR with IBM and report back) you could just do a test install to see if you run into any issues.
Having said all that, CMOD doesn't make use of any of the new / advanced features of DB2 -- so newer versions should be fine as long as there aren't major changes in the DB2 database configuration parameter names. (This happened in an older version of CMOD where the DB2 9.x changed the names of logging parameters, breaking the arsdb -c command.)
-JD.