[USN-7494-4] Linux kernel (Azure) vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7494-4
May 07, 2025

linux-azure, linux-azure-5.15, linux-azure-fde, linux-azure-fde-5.15
vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
- linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde-5.15: 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;
  - Netfilter;
(CVE-2023-52927, CVE-2023-52664)

Update instructions:

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

Ubuntu 22.04 LTS
  linux-image-5.15.0-1088-azure   5.15.0-1088.97
  linux-image-5.15.0-1088-azure-fde  5.15.0-1088.97.1
  linux-image-azure-fde-lts-22.04  5.15.0.1088.97.65
  linux-image-azure-lts-22.04     5.15.0.1088.86

Ubuntu 20.04 LTS
  linux-image-5.15.0-1088-azure   5.15.0-1088.97~20.04.1
  linux-image-5.15.0-1088-azure-fde  5.15.0-1088.97~20.04.1.1
  linux-image-azure               5.15.0.1088.97~20.04.1
  linux-image-azure-cvm           5.15.0.1088.97~20.04.1
  linux-image-azure-fde           5.15.0.1088.97~20.04.1.63

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-7494-4
  https://ubuntu.com/security/notices/USN-7494-3
  https://ubuntu.com/security/notices/USN-7494-2
  https://ubuntu.com/security/notices/USN-7494-1
  CVE-2023-52664, CVE-2023-52927

Package Information:
  https://launchpad.net/ubuntu/+source/linux-azure/5.15.0-1088.97
  https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1088.97.1
  https://launchpad.net/ubuntu/+source/linux-azure-5.15/5.15.0-1088.97~20.04.1
  https://launchpad.net/ubuntu/+source/linux-azure-fde-5.15/5.15.0-1088.97~20.04.1.1

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