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Ubuntu 16.04 LTS USN-3718-2 Critical: Boot Failures Fixed

ubuntu
Calendar Grey July 21, 2018
Dist Ubuntu Esm H88
An essential patch has been deployed for Ubuntu 16.04 LTS tackling kernel initiation issues and potential security vulnerabilities.
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-azure: Linux kernel for Microsoft Azure Cloud systems

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

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3695-2 fixed vulnerabilities in the Linux Hardware Enablement

Kernel (HWE) kernel for Ubuntu 16.04 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-2018-1108)

Wen Xu discovered that the ext4 file system implementation in the Linux

kernel d...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service information leak kernel fix ubuntu boot failure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1014-gcp     4.15.0-1014.14~16.04.1
  linux-image-4.15.0-1018-azure   4.15.0-1018.18~16.04.1
  linux-image-4.15.0-29-generic   4.15.0-29.31~16.04.1
  linux-image-4.15.0-29-generic-lpae  4.15.0-29.31~16.04.1
  linux-image-4.15.0-29-lowlatency  4.15.0-29.31~16.04.1
  linux-image-azure               4.15.0.1018.24
  linux-image-gcp                 4.15.0.1014.26
  linux-image-generic-hwe-16.04   4.13.0.45.64
  linux-image-generic-lpae-hwe-16.04  4.13.0.45.64
  linux-image-gke                 4.15.0.1014.26
  linux-image-lowlatency-hwe-16.04  4.13.0.45.64

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-3718-2

https://ubuntu.com/security/notices/USN-3718-1

https://bugs.launchpad.net/ubuntu/+bug/1779827, https://ubuntu.com/security/notices/USN-3695-2

Severity
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July 21, 2018

Topics%20covered

Topics Covered

security advisory denial of service information leak kernel fix ubuntu boot failure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1018.18~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1014.14~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-29.31~16.04.1

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