1. Ubuntu Security Notices
  2. USN-8801-1

USN-8801-1: Linux kernel (Azure CVM) vulnerabilities

Publication date

22 September 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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so had been revoked, bypassing memory protections or escalating privileges.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

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so had been revoked, bypassing memory protections or escalating privileges.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

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
26.04 LTS resolute 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
24.04 LTS noble 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

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›