How to seal cracks between stone veneer and soffit?
If you're looking for a long lasting repair, I'd suggest a gunnable rubberized/polyurethane caulk such as Sonolastic NP1. It comes in various colors. Depending on your locating, there MAY be a home improvement store, Lowe's and/or Home Depot specifically, that stocks it. If you don't have either around, you'll need to check with a roofing supply house.