Windows Ancillary Function Driver for WinSock 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.

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Security updates
10.0.17763.8027 — https://support.microsoft.com/help/5068791
10.0.20348.4405 — https://support.microsoft.com/help/5068787
10.0.20348.4346 — https://support.microsoft.com/help/5068840
10.0.19044.6575 — https://support.microsoft.com/help/5068781
10.0.26100.7171 — https://support.microsoft.com/help/5068861
10.0.26100.7092 — https://support.microsoft.com/help/5068966
10.0.22631.6199 — https://support.microsoft.com/help/5068865
10.0.25398.1965 — https://support.microsoft.com/help/5068779
10.0.14393.8594 — https://support.microsoft.com/help/5068864
6.0.6003.23624 — https://support.microsoft.com/help/5068906
6.0.6003.23624 — https://support.microsoft.com/help/5068909
6.1.7601.28021 — https://support.microsoft.com/help/5068904
6.1.7601.28021 — https://support.microsoft.com/help/5068908
6.2.9200.25768 — https://support.microsoft.com/help/5068907
6.3.9600.22869 — https://support.microsoft.com/help/5068905