A new CVE may enable yet another side-channel exploit in Intel processors. This vulnerability, known as CVE-2018-5407 (or "PortSmash"), targets Hyper-Threading (or simultaneous multi-threading (SMT)). It is confirmed as effective in Skylake and Kaby Lake chips, and could affect others.
https://www.notebookcheck.net/New-Side-Channel-Vulnerability-Confirmed-in-Kaby-Lake-and-Skylake-CPUs.355076.0.html