USN-3762-1: Linux kernel vulnerabilities

11 September 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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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