USN-3509-1: Linux kernel vulnerabilities

7 December 2017

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

  • Ubuntu 16.04 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-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16939)

It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service (application crashes) or possibly gain administrative privileges. (CVE-2017-1000405)

Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array implementation in the Linux kernel sometimes did not properly handle adding a new entry. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-12193)

Andrey Konovalov discovered an out-of-bounds read in the GTCO digitizer USB driver for the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16643)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1012-kvm - 4.4.0-1012.17
linux-image-4.4.0-103-generic - 4.4.0-103.126
linux-image-4.4.0-103-generic-lpae - 4.4.0-103.126
linux-image-4.4.0-103-lowlatency - 4.4.0-103.126
linux-image-4.4.0-103-powerpc-e500mc - 4.4.0-103.126
linux-image-4.4.0-103-powerpc-smp - 4.4.0-103.126
linux-image-4.4.0-103-powerpc64-emb - 4.4.0-103.126
linux-image-4.4.0-103-powerpc64-smp - 4.4.0-103.126
linux-image-4.4.0-1043-aws - 4.4.0-1043.52
linux-image-4.4.0-1079-raspi2 - 4.4.0-1079.87
linux-image-4.4.0-1081-snapdragon - 4.4.0-1081.86
linux-image-aws - 4.4.0.1043.45
linux-image-generic - 4.4.0.103.108
linux-image-generic-lpae - 4.4.0.103.108
linux-image-kvm - 4.4.0.1012.12
linux-image-lowlatency - 4.4.0.103.108
linux-image-powerpc-e500mc - 4.4.0.103.108
linux-image-powerpc-smp - 4.4.0.103.108
linux-image-powerpc64-emb - 4.4.0.103.108
linux-image-powerpc64-smp - 4.4.0.103.108
linux-image-raspi2 - 4.4.0.1079.79
linux-image-snapdragon - 4.4.0.1081.73

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