As of this time, there are no known reports that indicate that this Spectre Variant 2 (CVE-2017-5715 – "Branch Target Injection") has been used to attack customers. We recommend that, when appropriate, Windows users reenable the mitigation against CVE-2017-5715 when Intel reports that this unpredictable system behavior has been resolved for your device. I've heard that Intel has released microcode updates.