If I remember correctly, two Linux variants were on the list at one time.

They were:

Inspur K-UX (expired on 3 February 2019)

Huawei EulerOS (expired in September 2022)

https://en.wikipedia.org/wiki/Inspur_K-UX

https://en.wikipedia.org/wiki/EulerOS

These were both based on Red Hat.