[USN-7889-7] Linux kernel vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7889-7
December 16, 2025

linux-raspi, linux-raspi-realtime, linux-xilinx 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: Linux kernel for Raspberry Pi systems
- linux-raspi-realtime: Linux kernel for Raspberry Pi Real-time systems
- linux-xilinx: Linux kernel for Xilinx 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-6.8.0-1020-xilinx 6.8.0-1020.21
linux-image-6.8.0-1043-raspi 6.8.0-1043.47
linux-image-6.8.0-2034-raspi-realtime 6.8.0-2034.35
Available with Ubuntu Pro
linux-image-raspi 6.8.0-1043.47
linux-image-raspi-6.8 6.8.0-1043.47
linux-image-raspi-realtime 6.8.0-2034.35
Available with Ubuntu Pro
linux-image-raspi-realtime-6.8 6.8.0-2034.35
Available with Ubuntu Pro
linux-image-xilinx 6.8.0.1020.21
linux-image-xilinx-6.8 6.8.0.1020.21
linux-image-xilinx-zynqmp 6.8.0.1020.21

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-7889-7
https://ubuntu.com/security/notices/USN-7889-6
https://ubuntu.com/security/notices/USN-7889-5
https://ubuntu.com/security/notices/USN-7889-4
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-raspi/6.8.0-1043.47
https://launchpad.net/ubuntu/+source/linux-raspi-realtime/6.8.0-2034.35
https://launchpad.net/ubuntu/+source/linux-xilinx/6.8.0-1020.21