USN-4185-3: Linux kernel vulnerability and regression linux, linux-hwe, linux-oem vulnerability and regression A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 18.04 LTS Ubuntu 16.04 LTS Summary Several issues were fixed in the Linux kernel. Software Description linux – Linux kernel linux-oem – Linux kernel for OEM processors linux-hwe – Linux hardware enablement (HWE) kernel Details USN-4185-1 fixed vulnerabilities in the Linux kernel. It was discovered that the kernel fix for CVE-2019-0155 (i915 missing Blitter Command Streamer check) was incomplete on 64-bit Intel x86 systems. Also, the update introduced a regression that broke KVM guests where extended page tables (EPT) are disabled or not supported. This update addresses both issues. We apologize for the inconvenience. Original advisory details: Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz Lipp, [ more… ]