Brake Light On problems of the 2018 Mazda CX9

I wanted to say it happened to us while we were driving back from a daytrip on Saturday. We had our kids in the car and my husband was driving. All of a sudden the scbs light came on and the car just stopped giving gas. The car behind us couldn't tell we were slowing down because there was no brake light. We were almost rear ended. The car behind us couldn't stop in enough time so they just swerved onto the other side of us. We had to pull the car over and it was almost nighttime. My husband ended up pushing the car to get it off the road and to a safe place. It would only go 2 miles per hour. I had my car towed to the dealership, I have not heard anything from them except they are continuing to look into it. It's a 2018 Mazda Cx9 with only 26000 miles. It's never been in an accident. I'm hoping that whatever the fix is, it's covered under warranty. If it was a truck or bus behind us, they would not have been able to stop either. If we were on a highway and this happened, there is no doubt it would have caused an accident.