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Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized disclosure of system parameters to an attacker with local user access via a side-channel analysis, aka Rogue System Register Read (RSRE), Variant 3a.
Use CWE-203, Intel vendor hub and Atom C product page to widen CVE-2018-3640 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-3652, CVE-2018-3693 and CVE-2018-9056 for nearby disclosures in the same product family.