The NCAA ruled that Aaron must sit out the Cardinals' first nine games of the season after it was determined his family received "extra benefits related to housing."
Aaron has already missed seven games, and therefore can play for the first time at Western Kentucky on Dec. 20.
The 6-foot-7 guard was a four-star recruit coming out of high school and ranked No. 30 nationally by Rivals.com. Aaron was named the state player of the year in Washington as a senior.
Louisville is 7-0 to start the 2014-15 season, including a win over No. 12 Ohio State.
The No. 4 Cardinals play Indiana on Tuesday as part of the Jimmy V Classic at Madison Square Garden.
- Molly Geary