During the original disclosure, researchers detailed three vulnerabilities. Firstly, Variant 1 and Variant 2, dubbed Spectre and applicable to processors from Intel, AMD and ARM. Meanwhile, Variant 3, dubbed Meltdown, is only applicable to Intel processors. Further investigation uncovered Variant 3a, a new approach to exploitation of the Meltdown flaw, which allowed it to be extended to selected ARM processors as well.
Each variant, bar the ARM-specific Variant 3a, has its own entry in the Common Vulnerabilities and Exposures (CVE) database ( https://cve.mitre.org ), which can be searched for more information.
Variant 1: Bounds Check Bypass, CVE-2017-5753
Variant 2: Branch Target Injection, CVE-2017-5715
Variant 3: Rogue Cache Data Load, CVE-2017-5754
Variant 3: Rogue Cache Data Load (ARM variant), no CVE yet assigned…