Preheat oven to 350 degrees...Peel bananas and puree with a fork.
Add the cake mix, cinnamon, vanilla, eggs, oil and 1/2 cup of water, and bananas that have been puree into a bowl. Mix for 2 minutes then add the walnuts in. Spray bunt cake pan with pam, pour batter in pan and bake for 38 to 43 minutes, I myself took it out at 38 minutes.
For glaze, add confectioners sugar, pumpkin pie spice, vanilla and water in a small bowl and mix, drizzle over warm cake.