Security researchers from Qualys have recently revealed a flaw in the Linux kernel that could affect Red Hat, CentOS and Debian. Once having access to the targeted system, attackers could run their exploit so the buffer gets overflowed which allows the attacker to gain superuser access.
According to The Hacker News, the exploit works only on 64-bits systems and Linux Kernel versions 2.6.x, 3.10.x and 4.14.x are particularly endangered. However, updates have already been released to patch the flaw. Read more about this here.