USN-3678-3: Linux kernel (Azure) vulnerabilities
This update addresses 3 security issues in the Linux kernel for Microsoft Azure Cloud systems. Available for Ubuntu Linux 18.04 LTS

USN-3679-1: QEMU update
Ken Johnson and Jann Horn independently discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via sidechannel attacks. Available for Ubuntu Linux 14.04 LTS, 16.04 LTS, 17.10, and 18.04 LTS

USN-3680-1: libvirt vulnerability and update
This update adds Side channel execution mitigations to libvirt. Available for Ubuntu 14.04 LTS, 16.04 LTS, 17.10, and 18.04 LTS

USN-3681-1: ImageMagick vulnerabilities
This update fixes several security issues in ImageMagick. Available for Ubuntu 14.04 LTS, 16.04 LTS, 17.10, and 18.04 LTS

USN-3682-1: Firefox vulnerability
This update addresses an issue where Firefox could or run programs as your login if it opened a malicious website. Available for Ubuntu 14.04 LTS, 16.04 LTS, 17.10, and 18.04 LTS