[USN-8643-5] Linux kernel vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-8643-5
August 27, 2026

linux-azure-6.8, linux-ibm, linux-ibm-6.8, linux-oracle-6.8, linux-raspi,
linux-raspi-realtime 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-ibm: Linux kernel for IBM cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-raspi-realtime: Linux kernel for Raspberry Pi Real-time systems
- linux-azure-6.8: Linux kernel for Microsoft Azure cloud systems
- linux-ibm-6.8: Linux kernel for IBM cloud systems
- linux-oracle-6.8: Linux kernel for Oracle Cloud 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:
   - Network drivers;
   - Open vSwitch;
   - SCTP protocol;
(CVE-2026-53224, CVE-2026-53246, CVE-2026-53247, CVE-2026-64531)

Update instructions:

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

Ubuntu 24.04 LTS
   linux-image-6.8.0-1063-ibm      6.8.0-1063.64
   linux-image-6.8.0-1063-raspi    6.8.0-1063.67
   linux-image-6.8.0-2052-raspi-realtime  6.8.0-2052.54
                                   Available with Ubuntu Pro
   linux-image-ibm                 6.8.0-1063.64
   linux-image-ibm-6.8             6.8.0-1063.64
   linux-image-ibm-classic         6.8.0-1063.64
   linux-image-ibm-lts-24.04       6.8.0-1063.64
   linux-image-raspi               6.8.0-1063.67
   linux-image-raspi-6.8           6.8.0-1063.67
   linux-image-raspi-realtime      6.8.0-2052.54
                                   Available with Ubuntu Pro
   linux-image-raspi-realtime-6.8  6.8.0-2052.54
                                   Available with Ubuntu Pro

Ubuntu 22.04 LTS
   linux-image-6.8.0-1060-oracle   6.8.0-1060.63~22.04.1
   linux-image-6.8.0-1060-oracle-64k  6.8.0-1060.63~22.04.1
   linux-image-6.8.0-1063-ibm      6.8.0-1063.64~22.04.1
   linux-image-6.8.0-1065-azure    6.8.0-1065.73~22.04.1
   linux-image-azure               6.8.0-1065.73~22.04.1
   linux-image-azure-6.8           6.8.0-1065.73~22.04.1
   linux-image-ibm-6.8             6.8.0-1063.64~22.04.1
   linux-image-oracle              6.8.0-1060.63~22.04.1
   linux-image-oracle-6.8          6.8.0-1060.63~22.04.1
   linux-image-oracle-64k          6.8.0-1060.63~22.04.1
   linux-image-oracle-64k-6.8      6.8.0-1060.63~22.04.1

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-8643-5
   https://ubuntu.com/security/notices/USN-8643-4
   https://ubuntu.com/security/notices/USN-8643-3
   https://ubuntu.com/security/notices/USN-8643-2
   https://ubuntu.com/security/notices/USN-8643-1
   CVE-2026-53224, CVE-2026-53246, CVE-2026-53247, CVE-2026-64531

Package Information:
   https://launchpad.net/ubuntu/+source/linux-ibm/6.8.0-1063.64
   https://launchpad.net/ubuntu/+source/linux-raspi/6.8.0-1063.67
   https://launchpad.net/ubuntu/+source/linux-raspi-realtime/6.8.0-2052.54
   https://launchpad.net/ubuntu/+source/linux-azure-6.8/6.8.0-1065.73~22.04.1
   https://launchpad.net/ubuntu/+source/linux-ibm-6.8/6.8.0-1063.64~22.04.1
   https://launchpad.net/ubuntu/+source/linux-oracle-6.8/6.8.0-1060.63~22.04.1

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