Earlier in October, IBM released JVM patches for Notes and Domino for both the 1.6 and 1.8 versions of the JVM. Here's a link to the Interim Fix page with the download links.
This week, Interim Fix 1 for the 9.0.1 Notes client was released as well. If you have previously installed the JVM patches for the Notes client, you will want to re-install the JVM patch as the IF puts the previous version back in place.
So, the order I'd recommend following is:
- Install Interim Fix 1
- Install the JVM patches - both 1.6 and 1.8 for the client.
I would recommend this order for the Domino fix with the exception there is only the 1.8 JVM for the server.