USN-4255-1: Linux kernel vulnerabilities

28 January 2020

linux, linux-aws, linux-oem vulnerabilities

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

  • Ubuntu 18.04 LTS


Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-oem - Linux kernel for OEM processors


It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. (CVE-2019-14615)

It was discovered that a race condition can lead to a use-after-free while destroying GEM contexts in the i915 driver for the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-7053)

Update instructions

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

Ubuntu 18.04 LTS
linux-image-4.15.0-1058-aws - 4.15.0-1058.60
linux-image-4.15.0-1067-oem - 4.15.0-1067.77
linux-image-4.15.0-76-generic - 4.15.0-76.86
linux-image-4.15.0-76-generic-lpae - 4.15.0-76.86
linux-image-4.15.0-76-lowlatency - 4.15.0-76.86
linux-image-aws -
linux-image-aws-lts-18.04 -
linux-image-generic -
linux-image-generic-lpae -
linux-image-lowlatency -
linux-image-oem -
linux-image-powerpc-e500mc -
linux-image-powerpc-smp -
linux-image-powerpc64-emb -
linux-image-powerpc64-smp -
linux-image-virtual -

To update your system, please follow these instructions:

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.