Ejim supplied 25 points and eight rebounds, Kane contributed 22 points, seven rebounds and five assists and Niang chipped in 20 points with five assists for the Cyclones (20-5, 8-5 Big 12).
The win allowed Iowa State to avenge a Jan. 18 road loss to Texas.
Isaiah Taylor totaled 26 points and eight assists for the Longhorns (20-6, 9-4), who lost for just the second time in 11 games.
Javan Felix netted 16 points and Jonathan Holmes provided 14 with nine rebounds for Texas.
Celebrity Families of 2014 [PHOTOS]