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[USN-8801-1] Linux kernel (Azure CVM) vulnerabilities

Posted on 22 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8801-1
September 22, 2026

linux-azure-fde, linux-azure-fde-7.0 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 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-fde-7.0: Linux kernel for Microsoft Azure CVM cloud systems

Details:

It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)

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:
- Character device driver;
- Networking core;
- IPv6 networking;
- Unix domain sockets;
(CVE-2026-52938, CVE-2026-53325, CVE-2026-53361, CVE-2026-53362)

Update instructions:

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

Ubuntu 26.04 LTS
linux-image-7.0.0-1013-azure-fde 7.0.0-1013.13
linux-image-azure-fde 7.0.0-1013.13
linux-image-azure-fde-7.0 7.0.0-1013.13
linux-image-azure-fde-lts-26.04 7.0.0-1013.13

Ubuntu 24.04 LTS
linux-image-7.0.0-1013-azure-fde 7.0.0-1013.13~24.04.1
linux-image-azure-fde 7.0.0-1013.13~24.04.1
linux-image-azure-fde-7.0 7.0.0-1013.13~24.04.1

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-8801-1
CVE-2025-10263, CVE-2026-52938, CVE-2026-53325, CVE-2026-53361,
CVE-2026-53362

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure-fde/7.0.0-1013.13
https://launchpad.net/ubuntu/+source/linux-azure-fde-7.0/7.0.0-1013.13~24.04.1

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