If this is just a wall above ground on both sides you can mix up some concrete patch and fill the hole back in.
How to fix a large hole in a concrete wall.
For that size vertical hole you may need to brace a board over the hole to hold in the patch until it dries.
Patching such holes is a necessary part of keeping your concrete foundation wall in good repair.
The injection process fills the crack from top to bottom from inside to outside.
Cinder block is a useful construction material since it is normally lighter than solid concrete and yet still durable enough to last under normal stress conditions.
Holes this large make that type of fix impractical.
Or rather one very large thing.
How to fix a big hole in a cement wall when a posted a little while ago about sealing and patching holes in my garage i conveniently left one small thing out of the narrative.
Injecting a typical wall crack with an epoxy or urethane resin is done under pressure pushing the material from the inside all the way to the outside.
A huge hole in the cement wall that separates our garage from our basement.
How to fill large hole in an internal wall using a core which was cut out from a thermolite block using a core drill.
Patching a hole in a cinder block wall requires some time along with the appropriate materials to make the repair.
If this is a retaining wall you need to fix the problem ont he other side of the wall first.
How to fix a large hole in a cement block.
Holes occur in a cement block for a number of reasons ranging from the blunt force of something striking it to settling walls causing stress fractures.
If your aim is to make the wall look better a smooth surface is also easier to paint.
The only way to repair foundation wall cracks successfully is by the injection process.