Porter, a 2019 first-round draft pick, faces a charge of improperly handling a firearm in a vehicle, according to Mahoning County sheriff records. He was released on $4,000 bond. It was not immediately clear if he had an attorney who could comment on his arrest.
In a statement, the Cavaliers said: "We are aware of the situation involving Kevin Porter Jr. and are in the process of gathering information. We have spoken with Kevin and will continue to address this privately with him as the related process evolves.''
Porter's attorney, Alex Spiro, said in an email to the Associated Press that his client "was issued a summons for a petty offense and released. We are gathering information and will have further comment at a later point.''
Porter, 20, emerged as a bright spot last season for the Cavs, whose year included a coaching change after the All-Star break before being halted by the coronavirus pandemic. He averaged 10 points, 3.2 rebounds and 2.2 assists in 50 games.
Cleveland selected him with the No. 30 overall pick.