ThunderClap Flaws Bypass IOMMU to Re-Enable DMA Attacks on Windows, Apple, Linux, and other operating systems. Researchers: All Apple laptops and desktops produced since 2011 are vulnerable, with the exception of the 12-inch MacBook. Thunderbolt port allows connected peripherals to bypass operating system security policies and directly read/write system memory that contains passwords, banking logins, private files, and browser activity. The best way to fully protect yourself is to disable the Thunderbolt ports on your machine, if applicable.
Source: https://thehackernews.com/2019/02/thunderbolt-peripheral-dma-attacks.html