Ubuntu fixed a Linux bug that could have let an attacker cause a denial of service or execute arbitrary code with a TCP payload this week. The bug was introduced in version 223 of the Linux-based operating system, committed back in June 2015, and affects all subsequent versions, including 233, released in March this year. A software engineer with the company discovered the vulnerability, an out-of-bounds write (CVE-2017-9445) in Ubuntu s systemd-resolved system service.
Source: https://threatpost.com/linux-systemd-bug-could-have-led-to-crash-code-execution/126605/