========================================================================== Ubuntu Security Notice USN-3522-1 January 09, 2018 linux, linux-aws, linux-euclid, linux-kvm vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-euclid: Linux kernel for Intel Euclid systems - linux-kvm: Linux kernel for cloud environments Details: Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2017-5754) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-1015-kvm 4.4.0-1015.20 linux-image-4.4.0-1047-aws 4.4.0-1047.56 linux-image-4.4.0-108-generic 4.4.0-108.131 linux-image-4.4.0-108-lowlatency 4.4.0-108.131 linux-image-4.4.0-9021-euclid 4.4.0-9021.22 linux-image-aws 4.4.0.1047.49 linux-image-euclid 4.4.0.9021.21 linux-image-generic 4.4.0.108.113 linux-image-kvm 4.4.0.1015.15 linux-image-lowlatency 4.4.0.108.113 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://www.ubuntu.com/usn/usn-3522-1 CVE-2017-5754 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-108.131 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1047.56 https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9021.22 https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1015.20