[USN-8643-4] Linux kernel vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-8643-4
August 25, 2026

linux-aws-6.8, linux-azure-fde, linux-azure-fde-6.8, linux-azure-fips,
linux-nvidia-tegra vulnerabilities
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS
- linux-nvidia-tegra: Linux kernel for NVIDIA Tegra systems
- linux-aws-6.8: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-fde-6.8: Linux kernel for Microsoft Azure CVM cloud systems

Details:

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
   - Network drivers;
   - Open vSwitch;
   - SCTP protocol;
(CVE-2026-53224, CVE-2026-53246, CVE-2026-53247, CVE-2026-64531)

Update instructions:

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

Ubuntu 24.04 LTS
   linux-image-6.8.0-1032-nvidia-tegra  6.8.0-1032.34
   linux-image-6.8.0-1032-nvidia-tegra-rt  6.8.0-1032.34
   linux-image-6.8.0-1064-azure-fde  6.8.0-1064.71
   linux-image-6.8.0-1065-azure-fips  6.8.0-1065.73+fips1
                                   Available with Ubuntu Pro
   linux-image-azure-fde-6.8       6.8.0-1064.71
   linux-image-azure-fde-lts-24.04  6.8.0-1064.71
   linux-image-azure-fips          6.8.0-1065.73+fips1
                                   Available with Ubuntu Pro
   linux-image-azure-fips-6.8      6.8.0-1065.73+fips1
                                   Available with Ubuntu Pro
   linux-image-nvidia-tegra        6.8.0-1032.34
   linux-image-nvidia-tegra-6.8    6.8.0-1032.34
   linux-image-nvidia-tegra-rt     6.8.0-1032.34
   linux-image-nvidia-tegra-rt-6.8  6.8.0-1032.34

Ubuntu 22.04 LTS
   linux-image-6.8.0-1063-aws      6.8.0-1063.66~22.04.1
   linux-image-6.8.0-1063-aws-64k  6.8.0-1063.66~22.04.1
   linux-image-6.8.0-1064-azure-fde  6.8.0-1064.71~22.04.1
   linux-image-aws                 6.8.0-1063.66~22.04.1
   linux-image-aws-6.8             6.8.0-1063.66~22.04.1
   linux-image-aws-64k             6.8.0-1063.66~22.04.1
   linux-image-aws-64k-6.8         6.8.0-1063.66~22.04.1
   linux-image-azure-fde           6.8.0-1064.71~22.04.1
   linux-image-azure-fde-6.8       6.8.0-1064.71~22.04.1

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-8643-4
   https://ubuntu.com/security/notices/USN-8643-3
   https://ubuntu.com/security/notices/USN-8643-2
   https://ubuntu.com/security/notices/USN-8643-1
   CVE-2026-53224, CVE-2026-53246, CVE-2026-53247, CVE-2026-64531

Package Information:
   https://launchpad.net/ubuntu/+source/linux-azure-fde/6.8.0-1064.71
   https://launchpad.net/ubuntu/+source/linux-azure-fips/6.8.0-1065.73+fips1
   https://launchpad.net/ubuntu/+source/linux-nvidia-tegra/6.8.0-1032.34
   https://launchpad.net/ubuntu/+source/linux-aws-6.8/6.8.0-1063.66~22.04.1
  
https://launchpad.net/ubuntu/+source/linux-azure-fde-6.8/6.8.0-1064.71~22.04.1

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