RAC Upgrade from 11.2.0.2 to 11.2.0.3

First you need to patch vanilla 11.2.0.2 RAC to 11.2.0.2.5
1. Apply patch 6880880 to upgrade OPatch
2. Apply patch 13653086 to upgrade to 11.2.0.2.5

Apply one-off patch 12539000
1. Apply patch 12539000

Patch environment to 11.2.0.3
1. Apply patch 10404530