The latest Linux kernel flaw (CVE-2017-2636), which existed in the Linux kernel for the past seven years, allows a local unprivileged user to gain root privileges on affected systems or cause a denial of service (system crash) The vulnerability affects the majority of popular Linux distributions including Red Hat Enterprise Linux 6, 7 Debian, and Ubuntu. The vulnerability has already been patched and the security updates along with the vulnerability details were published on March 7. Users are encouraged to install the latest security updates as soon as possible, but if unable to apply the patch, the researcher advised blocking the flawed module (n_hdlc) manually.
Source: https://thehackernews.com/2017/03/linux-kernel-vulnerability.html