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

USN-4255-1: Linux kernel vulnerabilities

Publication date

28 January 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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

Details

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)

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
18.04 bionic 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 –  4.15.0.1058.59
linux-image-aws-lts-18.04 –  4.15.0.1058.59
linux-image-generic –  4.15.0.76.78
linux-image-generic-lpae –  4.15.0.76.78
linux-image-lowlatency –  4.15.0.76.78
linux-image-oem –  4.15.0.1067.71
linux-image-virtual –  4.15.0.76.78

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References

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