[USN-5577-1] Linux kernel (OEM) vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-5577-1
August 24, 2022

linux-oem-5.14 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-oem-5.14: Linux kernel for OEM systems

Details:

Asaf Modelevsky discovered that the Intel(R) 10GbE PCI Express (ixgbe)
Ethernet driver for the Linux kernel performed insufficient control flow
management. A local attacker could possibly use this to cause a denial of
service. (CVE-2021-33061)

It was discovered that the framebuffer driver on the Linux kernel did not
verify size limits when changing font or screen size, leading to an out-of-
bounds write. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-33655)

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.14.0-1049-oem     5.14.0-1049.56
  linux-image-oem-20.04           5.14.0.1049.45
  linux-image-oem-20.04b          5.14.0.1049.45
  linux-image-oem-20.04c          5.14.0.1049.45
  linux-image-oem-20.04d          5.14.0.1049.45

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-5577-1
  CVE-2021-33061, CVE-2021-33655

Package Information:
  https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1049.56

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