I try to remember to say something like this: "This is an interesting solution, but I'm not confident we have a shared understanding of the problem we're solving. I have a few guesses, but I don't want to bias the discussion, so please restate the problem without suggesting a solution. If it's too difficult to explain, I can suggest what problems I think you might be running into." I wish I always remembered to say that. :-)

Upper management material right there.