The Meltdown and Spectre attacks could allow attackers to steal sensitive data which is currently processed on the computer. Both attacks leverage the speculative execution technique used by most modern CPUs to optimize performance. The main vendors have rushed to provide security patches to protect their systems from these attacks. Microsoft has issued an out-of-band patch update for Windows 10, the other versions will be fixed with the next Patch Tuesday planned for January 9, 2018. Apple fixed most of these security holes in MacOS High Sierra 10.13.2 last month.”]
Source: https://securityaffairs.co/wordpress/67394/hacking/meltdown-spectre-attacks.html