Ubuntu 5591-1: Linux kernel vulnerability | LinuxSecurity.com

Advisories

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Ubuntu Security Notice USN-5591-1
August 31, 2022

linux-azure, linux-gcp, linux-hwe vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

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-4.15.0-1135-gcp     4.15.0-1135.151~16.04.2
   linux-image-4.15.0-1150-azure   4.15.0-1150.165~16.04.1
   linux-image-4.15.0-192-generic  4.15.0-192.203~16.04.1
   linux-image-4.15.0-192-lowlatency  4.15.0-192.203~16.04.1
   linux-image-azure               4.15.0.1150.137
   linux-image-gcp                 4.15.0.1135.129
   linux-image-generic-hwe-16.04   4.15.0.192.179
   linux-image-gke                 4.15.0.1135.129
   linux-image-lowlatency-hwe-16.04  4.15.0.192.179
   linux-image-oem                 4.15.0.192.179
   linux-image-virtual-hwe-16.04   4.15.0.192.179

Ubuntu 14.04 ESM:
   linux-image-4.15.0-1150-azure   4.15.0-1150.165~14.04.1
   linux-image-azure               4.15.0.1150.119

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-5591-1
   CVE-2021-33656

Ubuntu 5591-1: Linux kernel vulnerability

August 31, 2022

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 ESM - Ubuntu 14.04 ESM Summary: The system could be made to crash or run programs as an administrator. Software Description: - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel 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-4.15.0-1135-gcp 4.15.0-1135.151~16.04.2 linux-image-4.15.0-1150-azure 4.15.0-1150.165~16.04.1 linux-image-4.15.0-192-generic 4.15.0-192.203~16.04.1 linux-image-4.15.0-192-lowlatency 4.15.0-192.203~16.04.1 linux-image-azure 4.15.0.1150.137 linux-image-gcp 4.15.0.1135.129 linux-image-generic-hwe-16.04 4.15.0.192.179 linux-image-gke 4.15.0.1135.129 linux-image-lowlatency-hwe-16.04 4.15.0.192.179 linux-image-oem 4.15.0.192.179 linux-image-virtual-hwe-16.04 4.15.0.192.179 Ubuntu 14.04 ESM: linux-image-4.15.0-1150-azure 4.15.0-1150.165~14.04.1 linux-image-azure 4.15.0.1150.119 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-5591-1

CVE-2021-33656

Severity
Ubuntu Security Notice USN-5591-1

Package Information

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