Ubuntu 12.04 ESM USN-3655-2 Severe: Linux Kernel Denial of Service

The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: linux-image-3.13.0-149-generic 3.13.0-149.199~precise1 linux-image-3.13.0-149-generic-lpae 3.13.0-149.199~precise1 linux-image-generic-lpae-lts-trusty 3.13.0.149.140 linux-image-generic-lts-trusty 3.13.0.149.140 Please note that fully mitigating CVE-2018-3639 (Spectre Variant 4) may require corresponding processor microcode/firmware updates or, in virtual environments, hypervisor updates. On i386 and amd64 architectures, the SSBD feature is required to enable the kernel mitigations. BIOS vendors will be making updates available for Intel processors that implement SSBD. Ubuntu users with a processor from a different vendor should contact the vendor to identify necessary firmware updates. Ubuntu users in cloud environments should contact the cloud provider to confirm that the hypervisor has been updated to expose the new CPU features to virtual machines.