USN-3209-1: Linux kernel vulnerabilities

22 February 2017

linux, linux-raspi2 vulnerabilities

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

  • Ubuntu 16.10

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel
  • linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

It was discovered that the generic SCSI block layer in the Linux kernel did not properly restrict write operations in certain situations. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-10088)

Jim Mattson discovered that the KVM implementation in the Linux kernel mismanages the #BP and #OF exceptions. A local attacker in a guest virtual machine could use this to cause a denial of service (guest OS crash). (CVE-2016-9588)

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2017-6074)

Update instructions

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

Ubuntu 16.10
linux-image-4.8.0-1026-raspi2 - 4.8.0-1026.29
linux-image-4.8.0-39-generic - 4.8.0-39.42
linux-image-4.8.0-39-generic-lpae - 4.8.0-39.42
linux-image-4.8.0-39-lowlatency - 4.8.0-39.42
linux-image-4.8.0-39-powerpc-e500mc - 4.8.0-39.42
linux-image-4.8.0-39-powerpc-smp - 4.8.0-39.42
linux-image-4.8.0-39-powerpc64-emb - 4.8.0-39.42
linux-image-generic - 4.8.0.39.50
linux-image-generic-lpae - 4.8.0.39.50
linux-image-lowlatency - 4.8.0.39.50
linux-image-powerpc-e500mc - 4.8.0.39.50
linux-image-powerpc-smp - 4.8.0.39.50
linux-image-powerpc64-emb - 4.8.0.39.50
linux-image-raspi2 - 4.8.0.1026.29

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