Windows Hyper-V Elevation of Privilege Vulnerability

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?
Successful exploitation of this vulnerability could allow a Hyper-V guest to affect the functionality of the Hyper-V host.

What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker on a Nested Hyper-V environment would gain Level 1 Hyper-V Windows Root OS privileges. For diagrams and more detailed information please see Run Hyper-V in a Virtual Machine with Nested Virtualization.

Security updates
10.0.17763.3532 — https://support.microsoft.com/help/5018419
10.0.19043.2130 — https://support.microsoft.com/help/5018410
10.0.20348.1129 — https://support.microsoft.com/help/5018421
10.0.22000.1098 — https://support.microsoft.com/help/5018418
10.0.22621.674 — https://support.microsoft.com/help/5018427
10.0.14393.5427 — https://support.microsoft.com/help/5018411