Mabry was signed to the Seahawks' active roster Saturday, Michael-Shawn Dugar of The Athleticr reports.
Mabry has appeared in seven games for the Seahawks this season, but he hasn't seen a target on 20 offensive snaps. With Will Dissly (heel) questionable, Mabry has a shot to slide into the third position on the tight end positional depth chart Sunday against the Cardinals.