What if someone else get a DUI under my auto insurance?

If they were the permissive driver of your vehicle in an accident (and got the dui), your policy will be paying for the damages (subject to any policy exclusions, and assuming the drunk was At Fault) Insurance stays with the vehicle. So any rate increase that this accident generates will be on your policy, as well (of course) as your collison deductible. If you are asking what happens if they were just driving your vehicle and got a dui, no accident or loss. I doubt anything will happen. You might want to rethink who you let drive your vehicle though.