Looks like someone tried to fix it by filling it with glue.
Other then the crack it looks not too bad. It probably can be fixed, the first method that comes to my mind would be to "stitch" the crack by cutting some small slots perpendicular to the crack, and using some strips of wood as "stitches", glue them into the notches, then remove any extra wood from the strips. Although, this does seem like a very intrusive way of repairing the stock and almost might be a bubba, but would be much stronger then just gluing the crack, which has very clearly failed.