A Linux kernel security update has been released for Ubuntu Linux 20.04 LTS and 22.04 LTS.

USN-5592-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5592-1
September 01, 2022

linux-aws, linux-azure, linux-bluefield, linux-gcp, linux-gcp-5.4,
linux-gke, linux-gkeop, linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle,
linux-oracle-5.4 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-bluefield: Linux kernel for NVIDIA BlueField platforms
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-ibm-5.4: Linux kernel for IBM cloud systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud 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 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. (CVE-2021-33656)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1032-ibm 5.4.0-1032.36
linux-image-5.4.0-1045-bluefield 5.4.0-1045.50
linux-image-5.4.0-1052-gkeop 5.4.0-1052.55
linux-image-5.4.0-1074-kvm 5.4.0-1074.79
linux-image-5.4.0-1081-gke 5.4.0-1081.87
linux-image-5.4.0-1082-oracle 5.4.0-1082.90
linux-image-5.4.0-1084-aws 5.4.0-1084.91
linux-image-5.4.0-1087-gcp 5.4.0-1087.95
linux-image-5.4.0-1090-azure 5.4.0-1090.95
linux-image-aws-lts-20.04 5.4.0.1084.84
linux-image-azure-lts-20.04 5.4.0.1090.87
linux-image-bluefield 5.4.0.1045.44
linux-image-gcp-lts-20.04 5.4.0.1087.92
linux-image-gke 5.4.0.1081.89
linux-image-gke-5.4 5.4.0.1081.89
linux-image-gkeop 5.4.0.1052.53
linux-image-gkeop-5.4 5.4.0.1052.53
linux-image-ibm 5.4.0.1032.61
linux-image-ibm-lts-20.04 5.4.0.1032.61
linux-image-kvm 5.4.0.1074.71
linux-image-oracle-lts-20.04 5.4.0.1082.79

Ubuntu 18.04 LTS:
linux-image-5.4.0-1032-ibm 5.4.0-1032.36~18.04.1
linux-image-5.4.0-1082-oracle 5.4.0-1082.90~18.04.1
linux-image-5.4.0-1087-gcp 5.4.0-1087.95~18.04.1
linux-image-gcp 5.4.0.1087.66
linux-image-ibm 5.4.0.1032.46
linux-image-oracle 5.4.0.1082.90~18.04.59

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-5592-1
CVE-2021-33061, CVE-2021-33656

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1084.91
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1090.95
https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1045.50
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1087.95
https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1081.87
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1052.55
https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1032.36
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1074.79
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1082.90
https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1087.95~18.04.1
https://launchpad.net/ubuntu/+source/linux-ibm-5.4/5.4.0-1032.36~18.04.1

https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1082.90~18.04.1