[USN-7725-2] Linux kernel (Real-time) vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7725-2
August 28, 2025

linux-realtime, linux-raspi-realtime vulnerabilities
==========================================================================

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

- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-raspi-realtime: Linux kernel for Raspberry Pi Real-time systems
- linux-realtime: 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:
- Overlay file system;
- Network traffic control;
(CVE-2025-21887, CVE-2024-57996, CVE-2025-38350, CVE-2025-37752)

Update instructions:

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

Ubuntu 24.04 LTS
linux-image-6.8.0-2029-raspi-realtime 6.8.0-2029.30
Available with Ubuntu Pro
linux-image-6.8.1-1031-realtime 6.8.1-1031.32
Available with Ubuntu Pro
linux-image-raspi-realtime 6.8.0-2029.30
Available with Ubuntu Pro
linux-image-raspi-realtime-6.8 6.8.0-2029.30
Available with Ubuntu Pro
linux-image-realtime 6.8.1-1031.32
Available with Ubuntu Pro
linux-image-realtime-6.8.1 6.8.1-1031.32
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-7725-2
https://ubuntu.com/security/notices/USN-7725-1
CVE-2024-57996, CVE-2025-21887, CVE-2025-37752, CVE-2025-38350

Package Information:
https://launchpad.net/ubuntu/+source/linux-raspi-realtime/6.8.0-2029.30
https://launchpad.net/ubuntu/+source/linux-realtime/6.8.1-1031.32