At the time of writing, no. See the linked discussion. The real issue here, as the RightScale guys point out, is that there is no way to reliably provision a

At the time of writing, no. See the linked discussion. The real issue here, as the RightScale guys point out, is that there is no way to reliably provision a patched instance. Although the comment in the discussion forum by the EC2 fleet manager says they are working on a tool that will let us know whether an instance is fixed or not.