Booker grabbed seven rebounds and Dinwiddie had seven assists for the Buffaloes (13-2, 2-0 Pac-12), who improved to 11-0 at home.
Josh Scott came up with 15 points with 12 rebounds and Xavier Johnson added 15 points with seven boards as Colorado connected on a sizzling 56.4 percent of its shots from the floor and sank 33-of-39 free throws.
With CU trailing by 10 early in the second half, Dinwiddie drained a trio of 3-pointers to ignite a 15-4 run and assisted on a key Xavier Talton layup with 6:24 left to keep Colorado ahead.
Mike Moser scored 24 points for the Ducks (13-1, 1-1), who entered the game as one of seven remaining unbeaten teams in the nation.
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