Ubuntu alert USN-7889-3 (linux-realtime, linux-realtime-6.8)

From:
             
 
Giampaolo Fresi Roglia <giampaolo.fresi.roglia@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7889-3] Linux kernel (Real-time) vulnerabilities
Date:
             
 
Wed, 26 Nov 2025 10:51:33 +0100
Message-ID:
             
 
<87a509dsuy.fsf@canonical.com>
==========================================================================
Ubuntu Security Notice USN-7889-3
November 26, 2025

linux-realtime, linux-realtime-6.8 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-realtime: Linux kernel for Real-time systems
- linux-realtime-6.8: Linux kernel for Real-time 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:
  - Media drivers;
  - Network drivers;
  - Netfilter;
  - TLS protocol;
(CVE-2025-21729, CVE-2025-38227, CVE-2025-38616, CVE-2025-38678)

Update instructions:

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

Ubuntu 24.04 LTS
  linux-image-6.8.1-1038-realtime  6.8.1-1038.39
                                  Available with Ubuntu Pro
  linux-image-realtime            6.8.1-1038.39
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  linux-image-realtime-6.8.1      6.8.1-1038.39
                                  Available with Ubuntu Pro

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-7889-3
  https://ubuntu.com/security/notices/USN-7889-2
  https://ubuntu.com/security/notices/USN-7889-1
  CVE-2025-21729, CVE-2025-38227, CVE-2025-38616, CVE-2025-38678

Package Information:
  https://launchpad.net/ubuntu/+source/linux-realtime/6.8.1...
  https://launchpad.net/ubuntu/+source/linux-realtime-6.8/6...



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