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Ubuntu 18.04 LTS: USN-4255-1 Critical: Linux Kernel Issues

ubuntu
Calendar Grey January 27, 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: 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)

Topics%20covered

Topics Covered

security advisory Ubuntu kernel AWS OEM insufficient clearing

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                 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-powerpc-e500mc      4.15.0.76.78
  linux-image-powerpc-smp         4.15.0.76.78
  linux-image-powerpc64-emb       4.15.0.76.78
  linux-image-powerpc64-smp       4.15.0.76.78
  linux-image-virtual             4.15.0.76.78

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-4255-1

CVE-2019-14615, CVE-2020-7053

Severity
critical
Lowest
Low
Medium
High
Critical

January 28, 2020

Topics%20covered

Topics Covered

security advisory Ubuntu kernel AWS OEM insufficient clearing

Package Information

https://launchpad.net/ubuntu/+source/linux/4.15.0-76.86
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1058.60
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1067.77

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