[USN-3762-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3762-1
September 11, 2018

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2
vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

Several security issues were 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-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that the VirtIO subsystem in the Linux kernel did not
properly initialize memory in some situations. A local attacker could use
this to possibly expose sensitive information (kernel memory).
(CVE-2018-1118)

Seunghun Han discovered an information leak in the ACPI handling code in
the Linux kernel when handling early termination of ACPI table loading. A
local attacker could use this to expose sensitive informal (kernel address
locations). (CVE-2017-13695)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1019-gcp     4.15.0-1019.20
  linux-image-4.15.0-1021-aws     4.15.0-1021.21
  linux-image-4.15.0-1021-kvm     4.15.0-1021.21
  linux-image-4.15.0-1022-raspi2  4.15.0-1022.24
  linux-image-4.15.0-1023-azure   4.15.0-1023.24
  linux-image-4.15.0-34-generic   4.15.0-34.37
  linux-image-4.15.0-34-generic-lpae  4.15.0-34.37
  linux-image-4.15.0-34-lowlatency  4.15.0-34.37
  linux-image-4.15.0-34-snapdragon  4.15.0-34.37
  linux-image-aws                 4.15.0.1021.21
  linux-image-azure               4.15.0.1023.23
  linux-image-azure-edge          4.15.0.1023.23
  linux-image-gcp                 4.15.0.1019.21
  linux-image-generic             4.15.0.34.36
  linux-image-generic-lpae        4.15.0.34.36
  linux-image-gke                 4.15.0.1019.21
  linux-image-kvm                 4.15.0.1021.21
  linux-image-lowlatency          4.15.0.34.36
  linux-image-raspi2              4.15.0.1022.20
  linux-image-snapdragon          4.15.0.34.36

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://usn.ubuntu.com/usn/usn-3762-1
  CVE-2017-13695, CVE-2018-1118

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-34.37
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1021.21
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1023.24
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1019.20
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1021.21
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1022.24

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