Cliff Harris nearly doubling up a 65 MPH speed limit with two teammates in the car: that's an Oregon Ducks football problem. Cliff Harris doing so while driving a rental car paid for by a school employee: that's a University of Oregon problem.
Accordingly, school compliance officials are having a word with the renter, who has said Harris showed her his license and paid her for the keys. Not sure about the letter of the law here, but I'd be surprised if subletting a rental car works like that.
At best for Oregon fans, this is just a due diligence move. It could wind up being a minor violation of some sort. If the NCAA does have a problem with this incident, it might be quite a while before they can clear enough time to deal with it -- there's even another Oregon investigation ongoing that also potentially involves Harris, lest you forgot.