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The GPCIDrv and GDrv low-level drivers in GIGABYTE APP Center v1.05.21 and earlier, AORUS GRAPHICS ENGINE before 1.57, XTREME GAMING ENGINE before 1.26, and OC GURU II v2.08 expose functionality to read/write data from/to IO ports. This could be leveraged in a number of ways to ultimately run code with elevated privileges.
Use CWE-749, Gigabyte vendor hub and Aorus Graphics Engine product page to widen CVE-2018-19322 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-19323, CVE-2018-19321 and CVE-2018-19320 for nearby disclosures in the same product family.