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Ubuntu 16.04 LTS: USN-4255-2 Critical: Linux Kernel Security Fixes

ubuntu
Calendar Grey January 28, 2020
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- 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)

Topics%20covered

Topics Covered

security advisory denial of service memory leak ubuntu linux-hwe context switch aws-hwe

Update Instructions

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

Ubuntu 16.04 LTS:
  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

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://ubuntu.com/security/notices/USN-4255-2

https://ubuntu.com/security/notices/USN-4255-1

CVE-2019-14615, CVE-2020-7053

Severity
critical
Lowest
Low
Medium
High
Critical

January 28, 2020

Topics%20covered

Topics Covered

security advisory denial of service memory leak ubuntu linux-hwe context switch aws-hwe

Package Information

https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1058.60~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-76.86~16.04.1

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