There are no operating systems with an EAL greater than 5. There are single-purpose microprocessor controlled devices with higher ratings, but you are unlikely to ever find one.
It's a common level for smart cards, HSMs and the like, designed (with formal proofs etc) to be evaluated at that level. Those are easy enough to find.
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[ 2.6 ms ] story [ 28.9 ms ] threadCommon Criteria certification isn't a blanket blessing for a particular piece of software that says "this thing is Secure(tm)".
https://www.baesystems.com/en/product/stop-os# docs
https://en.wikipedia.org/wiki/XTS-400