USN-3819-1: Linux kernel vulnerability

Releases

• Ubuntu 18.10

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) 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

Felix Wilhelm discovered that the Xen netback driver in the Linux kernel
did not properly perform input validation in some situations. An 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 18.10

• linux-image-4.18.0-11-generic-lpae - 4.18.0-11.12
• linux-image-gke - 4.18.0.1003.3
• linux-image-4.18.0-1003-gcp - 4.18.0-1003.4
• linux-image-4.18.0-1004-aws - 4.18.0-1004.5
• linux-image-4.18.0-1004-kvm - 4.18.0-1004.4
• linux-image-generic-lpae - 4.18.0.11.12
• linux-image-4.18.0-1006-raspi2 - 4.18.0-1006.8
• linux-image-4.18.0-11-lowlatency - 4.18.0-11.12
• linux-image-4.18.0-11-generic - 4.18.0-11.12
• linux-image-generic - 4.18.0.11.12
• linux-image-snapdragon - 4.18.0.11.12
• linux-image-aws - 4.18.0.1004.4
• linux-image-kvm - 4.18.0.1004.4
• linux-image-gcp - 4.18.0.1003.3
• linux-image-lowlatency - 4.18.0.11.12
• linux-image-raspi2 - 4.18.0.1006.3
• linux-image-4.18.0-11-snapdragon - 4.18.0-11.12

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-2018-15471

Related notices

• USN-3820-3: linux-azure, linux-image-unsigned-4.15.0-1031-azure
• USN-3820-2: linux-image-unsigned-4.15.0-39-lowlatency, linux-hwe, linux-image-unsigned-4.15.0-1031-azure, linux-gcp, linux-image-4.15.0-39-generic, linux-image-4.15.0-39-generic-lpae, linux-image-unsigned-4.15.0-1024-gcp, linux-image-unsigned-4.15.0-39-generic, linux-azure, linux-image-4.15.0-39-lowlatency
• USN-3820-1: linux, linux-image-unsigned-4.15.0-39-lowlatency, linux-image-4.15.0-1027-aws, linux-image-4.15.0-39-snapdragon, linux-image-4.15.0-39-generic, linux-image-unsigned-4.15.0-39-generic, linux-image-4.15.0-1026-kvm, linux-oem, linux-image-unsigned-4.15.0-1026-oem, linux-azure, linux-kvm, linux-raspi2, linux-gcp, linux-image-unsigned-4.15.0-1024-gcp, linux-image-unsigned-4.15.0-1031-azure, linux-aws, linux-image-4.15.0-39-generic-lpae, linux-image-4.15.0-39-lowlatency, linux-image-4.15.0-1028-raspi2