USN-4161-1: Linux kernel vulnerability

Releases

• Ubuntu 19.10

Packages

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

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

• CVE-2019-18198