Ubuntu 18.04 LTS USN-3718-1: Fix for Moderate Boot Failures Now Available

ubuntu

July 21, 2018

A regression that caused boot failures was fixed in the Linux kernel.

Summary

A regression that caused boot failures was fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oem: Linux kernel for OEM processors

Details:

USN-3695-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04

LTS. Unfortunately, the fix for CVE-2018-1108 introduced a regression

where insufficient early entropy prevented services from starting,

leading in some situations to a failure to boot, This update addresses

the issue.

We apologize for the inconvenience.

Original advisory details:

Jann Horn discovered that the Linux kernel's implementation of random

seed data reported that it was in a ready state before it had gathered

sufficient entropy. An attacker could use this to expose sensitive

information. (CVE-...

Read the Full Advisory

Topics Covered

security advisory update instructions ubuntu kernel regression boot failure

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1014-gcp     4.15.0-1014.14
  linux-image-4.15.0-1016-aws     4.15.0-1016.16
  linux-image-4.15.0-1016-kvm     4.15.0-1016.16
  linux-image-4.15.0-1018-azure   4.15.0-1018.18
  linux-image-4.15.0-29-generic   4.15.0-29.31
  linux-image-4.15.0-29-generic-lpae  4.15.0-29.31
  linux-image-4.15.0-29-lowlatency  4.15.0-29.31
  linux-image-4.15.0-29-snapdragon  4.15.0-29.31
  linux-image-aws                 4.15.0.1016.16
  linux-image-azure               4.15.0.1018.18
  linux-image-gcp                 4.15.0.1014.16
  linux-image-generic             4.15.0.29.31
  linux-image-generic-lpae        4.15.0.29.31
  linux-image-gke                 4.15.0.1014.16
  linux-image-kvm                 4.15.0.1016.16
  linux-image-lowlatency          4.15.0.29.31
  linux-image-oem                 4.15.0.1012.14
  linux-image-snapdragon          4.15.0.29.31

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.