OEMs have been patching machines that were released before the identification of Plundervolt too. The same should apply to upcoming Tiger Lake laptops, too. Anecdotally, the Surface Book 3 15 does not support undervolting, which uses an Intel Core i7-1065G7 processor. Going forward, it would seem that all new Intel devices do not support undervolting. You can read Intel's response and the details of the CVE-2019-11157 vulnerability here.
Intel has since addressed the exploit by allowing OEMs to disable undervolting via a firmware update.
According to Intel, all of its desktop and mobile processors from 6th generation Core processors onwards are affected, as are Core X-series and recent Xeon E chips. In summary, Plundervolt exploits Intel Software Guard Extensions (SGX), which is a set of instruction codes that undervolting programs like Throttlestop and XTU use to manipulate CPU voltages. You can read the research team's findings in its research paper, which can be found here. There is no one catch-all here, but the reasoning behind disabling undervolting is Plundervolt, an exploit discovered by the University of Birmingham. While Dell has warned that undervolting can void warranties, Intel and some OEMs have gone a step further and have disabled undervolting altogether. Two of the most popular undervolting programs are Intel Extreme Tuning Utility (XTU) and Throttlestop, the differences between which you can read in our guides to using the programs. It has been a few years since we published guides on undervolting, the act of restricting CPU voltages to reduce temperatures and improve battery life.
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