Ubuntu 3740-2: Linux kernel (HWE) vulnerabilities
Summary
Update Instructions
The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.15.0-1017-gcp 4.15.0-1017.18~16.04.1 linux-image-4.15.0-1021-azure 4.15.0-1021.21~16.04.1 linux-image-4.15.0-32-generic 4.15.0-32.35~16.04.1 linux-image-4.15.0-32-generic-lpae 4.15.0-32.35~16.04.1 linux-image-4.15.0-32-lowlatency 4.15.0-32.35~16.04.1 linux-image-azure 4.15.0.1021.27 linux-image-gcp 4.15.0.1017.29 linux-image-generic-hwe-16.04 4.15.0.32.54 linux-image-generic-lpae-hwe-16.04 4.15.0.32.54 linux-image-gke 4.15.0.1017.29 linux-image-lowlatency-hwe-16.04 4.15.0.32.54 linux-image-virtual-hwe-16.04 4.15.0.32.54 Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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://ubuntu.com/security/notices/USN-3740-2
https://ubuntu.com/security/notices/USN-3740-1
CVE-2018-3620, CVE-2018-3646, CVE-2018-5391,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
Package Information
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1021.21~16.04.1 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1017.18~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-32.35~16.04.1