Kuhnel was designated for assignment by the Astros on Tuesday, Matt Kawahara of the Houston Chronicle reports.
Kuhnel's DFA was one of several roster moves by the Astros on Tuesday, with the others being the placement of Grae Kessinger (shoulder) on the 10-day injured list and the promotion of Joey Loperfido to the big-league club. Considering Kuhnel was tagged for four runs in his only MLB appearance this season but owns a 3.18 ERA in 11.1 innings in Triple-A, so it's at least within the realm of possibility he could be claimed by another organization.