Ubuntu 3823-1: Linux kernel vulnerabilities
Summary
Update Instructions
The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: linux-image-3.2.0-137-generic 3.2.0-137.183 linux-image-3.2.0-137-generic-pae 3.2.0-137.183 linux-image-3.2.0-137-highbank 3.2.0-137.183 linux-image-3.2.0-137-omap 3.2.0-137.183 linux-image-3.2.0-137-powerpc-smp 3.2.0-137.183 linux-image-3.2.0-137-powerpc64-smp 3.2.0-137.183 linux-image-3.2.0-137-virtual 3.2.0-137.183 linux-image-generic 3.2.0.137.152 linux-image-generic-pae 3.2.0.137.152 linux-image-highbank 3.2.0.137.152 linux-image-omap 3.2.0.137.152 linux-image-powerpc 3.2.0.137.152 linux-image-powerpc-smp 3.2.0.137.152 linux-image-powerpc64-smp 3.2.0.137.152 linux-image-virtual 3.2.0.137.152 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-3823-1
CVE-2018-3620, CVE-2018-3646,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
Package Information