Probably the most important change in the AV Linux 2018.4.2 release is the implementation of the KPTI (Kernel page-table isolation) patch to protect users against the Meltdown security vulnerability, but only for 64-bit installations. The distribution is now powered by the long-term supported Linux 4.9.76 kernel, and users can disable the KPTI patch at boot. This is also the first AV Linux release to add UEFI install support, though it’s only been tested in VirtualBox for now. It adds new firmware for Echo Audio devices, the ability to dynamically adjust the CPU frequency, a real-time Quick Config scan to check system tuning, and re-adds the Kdenlive video editor.