Interior brick wall insulation
Insulating masonry walls is not much different than insulating basement walls. If the cinder blocks have open cores, pour type insulation can be placed in those cores. That will be a fairly low R value, but some insulation beats none. Adding insulation beyond that level will require a layer of insulation on the inside surface of the masonry wall.
Montana State has a good and simple explanation in one of their publications. INSULATING SIDE WALLS OF EXISTING HOMES
Suggested values for insulation are listed in the Missouri publication, Insulating and Weatherizing Your Home.