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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 and write arbitrary physical memory. This could be leveraged by a local attacker to elevate privileges.
Use Gigabyte vendor hub and Aorus Graphics Engine product page to widen CVE-2018-19321 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-19323, CVE-2018-19322 and CVE-2018-19320 for nearby disclosures in the same product family.