Linus Torvalds merged WireGuard VPN protocol into Linux kernel for version 5.6.6. WireGuard is lean-coded, fast, modern, and secure VPN protocol has made it into the Linux kernel. The next Linux kernel is expected to be released in just a few months, considering that the latest refresh occurred on January 26. In its current form, WireGuard has about 4,000 lines of code, a fraction of what makes OpenVPN tick without the required OpenSSL or the hundreds of lines behind IPsec VPN.
Source: https://www.bleepingcomputer.com/news/security/linux-kernel-56-source-tree-includes-wireguard-vpn/