Solved! Go to Solution.
Non-certification of an environment does not necessarily mean it is not supported. That environment is supported if it meets or exceeds the base build environment and that environment is known to not fail. Environments that are known to not work are usually documented on the product support page as soon as that information is available.
Frankly, I think your OS version is ancient (and therefore vulnerable) -- I'm using 5.10 with
30-odd patches applied. Running the newest database on a neglected OS is still risky.