I was thinking of the exploit back from 2023 that effected Acura, Genesis, Honda, Hyundai, Kia, Infiniti, Nissan, and Porsche. I remember it being discussed on HN at the time but I can't find the relevant thread. Here is an article covering it: https://www.securityweek.com/16-car-makers-and-their-vehicle..., at the time.