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Ubuntu Security Notice USN-4161-1

Ubuntu Security Notice USN-4161-1
Posted Oct 21, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4161-1 - 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 or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-18198
SHA-256 | 7f05d7a2372c61a56be48149f14923a9ec6644cf190738c69eb8ef764a49a3cf

Ubuntu Security Notice USN-4161-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4161-1
October 21, 2019

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

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:
https://usn.ubuntu.com/4161-1
CVE-2019-18198

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.3.0-19.20
https://launchpad.net/ubuntu/+source/linux-aws/5.3.0-1004.4
https://launchpad.net/ubuntu/+source/linux-azure/5.3.0-1004.4
https://launchpad.net/ubuntu/+source/linux-gcp/5.3.0-1005.5
https://launchpad.net/ubuntu/+source/linux-kvm/5.3.0-1004.4
https://launchpad.net/ubuntu/+source/linux-raspi2/5.3.0-1008.9
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