1. Ubuntu Security Notices
  2. USN-4255-2

USN-4255-2: Linux kernel (HWE) vulnerabilities

Publication date

28 January 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

USN-4255-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.

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)

USN-4255-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
16.04 xenial linux-image-4.15.0-1058-aws –  4.15.0-1058.60~16.04.1
linux-image-4.15.0-76-generic –  4.15.0-76.86~16.04.1
linux-image-4.15.0-76-generic-lpae –  4.15.0-76.86~16.04.1
linux-image-4.15.0-76-lowlatency –  4.15.0-76.86~16.04.1
linux-image-aws-hwe –  4.15.0.1058.58
linux-image-generic-hwe-16.04 –  4.15.0.76.96
linux-image-generic-lpae-hwe-16.04 –  4.15.0.76.96
linux-image-lowlatency-hwe-16.04 –  4.15.0.76.96
linux-image-oem –  4.15.0.76.96
linux-image-virtual-hwe-16.04 –  4.15.0.76.96

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References

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