[USN-4683-1] Linux kernel (OEM) vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-4683-1
January 07, 2021

linux-oem-5.6 vulnerability
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

The system could be made to crash or expose sensitive information
under certain conditions.

Software Description:
- linux-oem-5.6: Linux kernel for OEM systems

Details:

Minh Yuan discovered that the framebuffer console driver in the Linux
kernel did not properly handle fonts in some conditions. A local attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information (kernel memory).

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.6.0-1039-oem      5.6.0-1039.43
  linux-image-oem-20.04           5.6.0.1039.37

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://usn.ubuntu.com/4683-1
  CVE-2020-28974

Package Information:
  https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1039.43

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