The Bills activated their fourth player of the week from their reserve/COVID-19 list on Thursday.
Jackson was a seventh-round pick this year. He had 149 tackles, nine tackles for loss, four interceptions, four forced fumbles and 1.5 sacks during his four years at Pitt.
The Bills waived safety Garrett Taylor in a corresponding move. Taylor signed with the team after going undrafted out of Penn State this April.