The solution is using the least change and the least testing..

Updating the source code for the flash plugin (code which Nokia has under license from Adobe) means the problem is fixed..

Creating a framework around microb to prevent malicious activity by the plugin would be tremendously complex.. and would introduce a massive change to the system..

The problem is two part.. how many resources are needed to fix the bug (which will come from adobe presumably under a support contract.. but it may be an additional charge) and how many resources are required to test the code change has not affected things like the camera, the chess game, the LED indicator driver.. and other stuff that on a stable system should never be affected but presumably will still need to be tested..