A buffer overflow (CVE-2020-10713) in the GRUB 2 boot loader can allow an attacker to gain code execution on many Linux systems and possibly some Windows computers.
The WireGuard VPN is now a default part of the Linux 5.6 kernel.
A flaw in the sudo utility could allow a local user to gain root privileges if the pwfeedback option is enabled.
A vulnerability in many Linux distributions, as well as Android and iOS, can allow an attacker to hijack VPN connections in some cases.
It took only a few days for a Linux worm to start exploiting the vulnerability in the Exim mail transfer agent. Microsoft said some Azure customers have already been affected.