USN-4161-1: Linux kernel vulnerability

  • Thread starter Ubuntu security notices
  • Start date
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Ubuntu security notices

Guest
linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2 vulnerability


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

  • Ubuntu 19.10
Summary


The system could be made to crash under certain conditions.

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 IPv6 routing implementation in the Linux kernel contained a reference counting error leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Update instructions


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

Ubuntu 19.10
linux-image-5.3.0-1004-aws - 5.3.0-1004.4
linux-image-5.3.0-1004-azure - 5.3.0-1004.4
linux-image-5.3.0-1004-kvm - 5.3.0-1004.4
linux-image-5.3.0-1005-gcp - 5.3.0-1005.5
linux-image-5.3.0-1008-raspi2 - 5.3.0-1008.9
linux-image-5.3.0-19-generic - 5.3.0-19.20
linux-image-5.3.0-19-generic-lpae - 5.3.0-19.20
linux-image-5.3.0-19-lowlatency - 5.3.0-19.20
linux-image-5.3.0-19-snapdragon - 5.3.0-19.20
linux-image-aws - 5.3.0.1004.5
linux-image-azure - 5.3.0.1004.21
linux-image-gcp - 5.3.0.1005.5
linux-image-generic - 5.3.0.19.22
linux-image-generic-lpae - 5.3.0.19.22
linux-image-gke - 5.3.0.1005.5
linux-image-kvm - 5.3.0.1004.4
linux-image-lowlatency - 5.3.0.19.22
linux-image-raspi2 - 5.3.0.1008.4
linux-image-snapdragon - 5.3.0.19.22
linux-image-virtual - 5.3.0.19.22

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


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