WinRing0: Why Windows is flagging your monitoring and fan control apps as threat

WinRing0 is associated with CVE-2020-14979 where any local program can take complete control (NT AUTHORITY\SYSTEM) over your system: https://nvd.nist.gov/vuln/detail/cve-2020-14979

It is possible, although not confirmed, that the block was motivated by an ongoing malware threat that involves this particular threat, but take this with a grain of salt.