I get it, the hole is on the outside leaking in. But you see the holes inside and think you need to fill it. Get some repair mortar and start fixing from the outside. I have used a can of spray foam first to start to fill in the hole, then patch.
You need to control the water from the outside with gutters and drainage. How you got the hole in the first place is a question I would figure out also.
Our resident mudmixer may come by with more specifics.