Out of the the box, the V2 Exadata supported 126.96.36.199. The latest Exadata servers (X2-2 and X2-8) are installed with 188.8.131.52, and 184.108.40.206 once it's supported on Exadata. It's not possible to run 10g using Exadata storage.
Both oracle database versions 220.127.116.11 and 18.104.22.168 are currently supported.
Since September 2011, no new exadata bundle patches for 22.214.171.124 are issued by oracle.
Exadata certification/support for 126.96.36.199 is pending, as andy indicated.