Canonical Outs Important Linux Kernel Security Updates for All Supported Ubuntu Releases

The most important security issue fixed in this new Linux kernel update was discovered in the SELinux network label handling implementation by Matthew Sheets. This vulnerability (CVE-2020-10711) affects Ubuntu 20.04 LTS, 19.10, 18.04 LTS, and 16.04 LTS, and could allow a remote attacker to cause a denial of service (system crash). On Ubuntu 19.10 and Ubuntu 18.04 LTS systems using either Linux 5.3 or 5.0 kernels, the new security update addresses another important vulnerability (CVE-2020-10751) discovered by Dmitry Vyukov in the SELinux netlink security hook, which could allow a privileged attacker to bypass SELinux netlink restrictions.