Two kernel updates are available for the Ubuntu 18.04 LTS (Bionic Beaver) and Ubuntu 16.04.6 LTS (Xenial Xerus) operating system series running the Linux 4.15 LTS kernel series, as well as Ubuntu 16.04 LTS systems running the Linux 4.4 LTS kernel series. Two issues are common for both the Linux 4.15 and 4.4 kernel series, namely a flaw (CVE-2020-11494) discovered in the Serial CAN interface driver that could allow a local attacker to expose sensitive information (kernel memory) and a vulnerability (CVE-2020-11565) that could let a local attacker with access to specify mount options to the tmpfs virtual memory file system to crash the system by causing a denial of service.