A fourth-round pick from Cal, Buchanan became a starter in Week 2. He finished third on the team in tackles (93) behind Roquan Smith (130) and Kyle Hamilton (105), despite suffering a season-ending torn ACL in Week 14.
Buchanan registered a season-high 15 tackles against the Houston Texans in Week 5 and had at least eight tackles in five different games. Making 13 starts in 14 games, Buchanan was also a consistent contributor on special teams.