1. Ubuntu Security Notices
  2. USN-3762-1

USN-3762-1: Linux kernel vulnerabilities

Publication date

11 September 2018

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • 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)

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
18.04 bionic 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-4.15.0-34-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

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References

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