USN-3189-1: Linux kernel vulnerabilities

3 February 2017

linux, 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 kernel.

Software Description

  • linux - Linux kernel
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon Processors

Details

Mikulas Patocka discovered that the asynchronous multibuffer cryptographic daemon (mcryptd) in the Linux kernel did not properly handle being invoked with incompatible algorithms. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-10147)

Qidan He discovered that the ICMP implementation in the Linux kernel did not properly check the size of an ICMP header. A local attacker with CAP_NET_ADMIN could use this to expose sensitive information. (CVE-2016-8399)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1042-raspi2 - 4.4.0-1042.49
linux-image-4.4.0-1046-snapdragon - 4.4.0-1046.50
linux-image-4.4.0-62-generic - 4.4.0-62.83
linux-image-4.4.0-62-generic-lpae - 4.4.0-62.83
linux-image-4.4.0-62-lowlatency - 4.4.0-62.83
linux-image-4.4.0-62-powerpc-e500mc - 4.4.0-62.83
linux-image-4.4.0-62-powerpc-smp - 4.4.0-62.83
linux-image-4.4.0-62-powerpc64-emb - 4.4.0-62.83
linux-image-4.4.0-62-powerpc64-smp - 4.4.0-62.83
linux-image-generic - 4.4.0.62.65
linux-image-generic-lpae - 4.4.0.62.65
linux-image-lowlatency - 4.4.0.62.65
linux-image-powerpc-e500mc - 4.4.0.62.65
linux-image-powerpc-smp - 4.4.0.62.65
linux-image-powerpc64-emb - 4.4.0.62.65
linux-image-powerpc64-smp - 4.4.0.62.65
linux-image-raspi2 - 4.4.0.1042.41
linux-image-snapdragon - 4.4.0.1046.38

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