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This appears to be one of the four ZombieLoad/RIDL variations, rather than a new attack: https://zombieloadattack.com/

Yes, this is a RIDL variant called "L1D Eviction Sampling". Bolt the RIDL paper (Addendum 2 B [1]) and the CacheOut paper refer to the CVE-2020-0549: "L1D Eviction Sampling (L1Des) Leakage".

But the CacheOut paper describes how to use it in practice and why the intel fix is not sufficient.

[1]: https://mdsattacks.com/files/ridl.pdf#page=20

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