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Ubuntu 5591-1 Critical: Linux Kernel Denial of Service Threat

ubuntu
Calendar Grey August 31, 2022
Dist Ubuntu Esm H88
The Ubuntu 5591-1 advisory warns of a severe kernel vulnerability that can cause system disruptions and enable potential unauthorized access. Urgent updates needed
The system could be made to crash or run programs as an administrator.

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.

Topics%20covered

Topics Covered

security advisory denial of service update instructions ubuntu system crash linux kernel

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
critical
Lowest
Low
Medium
High
Critical

August 31, 2022

Topics%20covered

Topics Covered

security advisory denial of service update instructions ubuntu system crash linux kernel

Package Information

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