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Ubuntu Security Notice USN-5591-2

Ubuntu Security Notice USN-5591-2
Posted Sep 2, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5591-2 - It was discovered that the virtual terminal driver in the Linux kernel did not properly handle VGA console font changes, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-33656
SHA-256 | db40eac16b929a828e0ceae11a878e45fe98401a42ca393e0cf85e15fcc72726

Ubuntu Security Notice USN-5591-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5591-2
September 01, 2022

linux-aws-hwe vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM

Summary:

The system could be made to crash or run programs as an administrator.

Software Description:
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

Details:

It was discovered that the virtual terminal driver in the Linux kernel
did not properly handle VGA console font changes, 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.

Update instructions:

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

Ubuntu 16.04 ESM:
linux-image-4.15.0-1140-aws-hwe 4.15.0-1140.151~16.04.1
linux-image-aws-hwe 4.15.0.1140.127

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-5591-2
https://ubuntu.com/security/notices/USN-5591-1
CVE-2021-33656
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