[USN-7758-2] Linux kernel vulnerability

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7758-2
September 19, 2025

linux-ibm, linux-ibm-6.8, linux-nvidia, linux-nvidia-6.8,
linux-nvidia-lowlatency, linux-raspi vulnerability
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

The system could be made to crash or run programs as an administrator.

Software Description:
- linux-ibm: Linux kernel for IBM cloud systems
- linux-nvidia: Linux kernel for NVIDIA systems
- linux-nvidia-lowlatency: Linux low latency kernel for NVIDIA systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-ibm-6.8: Linux kernel for IBM cloud systems
- linux-nvidia-6.8: Linux kernel for NVIDIA systems

Details:

It was discovered that the AF_UNIX socket garbage collection implementation
in Ubuntu Noble's 6.8 kernel did not properly handle out-of-band (OOB)
messages, leading to a use-after-free vulnerability. An attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 24.04 LTS
  linux-image-6.8.0-1036-ibm      6.8.0-1036.36
  linux-image-6.8.0-1038-nvidia   6.8.0-1038.41
  linux-image-6.8.0-1038-nvidia-64k  6.8.0-1038.41
  linux-image-6.8.0-1038-nvidia-lowlatency  6.8.0-1038.41.1
  linux-image-6.8.0-1038-nvidia-lowlatency-64k  6.8.0-1038.41.1
  linux-image-6.8.0-1038-raspi    6.8.0-1038.42
  linux-image-ibm                 6.8.0-1036.36
  linux-image-ibm-6.8             6.8.0-1036.36
  linux-image-ibm-classic         6.8.0-1036.36
  linux-image-ibm-lts-24.04       6.8.0-1036.36
  linux-image-nvidia              6.8.0-1038.41
  linux-image-nvidia-6.8          6.8.0-1038.41
  linux-image-nvidia-64k          6.8.0-1038.41
  linux-image-nvidia-64k-6.8      6.8.0-1038.41
  linux-image-nvidia-lowlatency   6.8.0-1038.41.1
  linux-image-nvidia-lowlatency-6.8  6.8.0-1038.41.1
  linux-image-nvidia-lowlatency-64k  6.8.0-1038.41.1
  linux-image-nvidia-lowlatency-64k-6.8  6.8.0-1038.41.1
  linux-image-raspi               6.8.0-1038.42
  linux-image-raspi-6.8           6.8.0-1038.42

Ubuntu 22.04 LTS
  linux-image-6.8.0-1036-ibm      6.8.0-1036.36~22.04.1
  linux-image-6.8.0-1038-nvidia   6.8.0-1038.41~22.04.1
  linux-image-6.8.0-1038-nvidia-64k  6.8.0-1038.41~22.04.1
  linux-image-ibm-6.8             6.8.0-1036.36~22.04.1
  linux-image-nvidia-6.8          6.8.0-1038.41~22.04.1
  linux-image-nvidia-64k-6.8      6.8.0-1038.41~22.04.1
  linux-image-nvidia-64k-hwe-22.04  6.8.0-1038.41~22.04.1
  linux-image-nvidia-hwe-22.04    6.8.0-1038.41~22.04.1

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-7758-2
  https://ubuntu.com/security/notices/USN-7758-1
  https://launchpad.net/bugs/2121515

Package Information:
  https://launchpad.net/ubuntu/+source/linux-ibm/6.8.0-1036.36
  https://launchpad.net/ubuntu/+source/linux-nvidia/6.8.0-1038.41
  https://launchpad.net/ubuntu/+source/linux-nvidia-lowlatency/6.8.0-1038.41.1
  https://launchpad.net/ubuntu/+source/linux-raspi/6.8.0-1038.42
  https://launchpad.net/ubuntu/+source/linux-ibm-6.8/6.8.0-1036.36~22.04.1
  https://launchpad.net/ubuntu/+source/linux-nvidia-6.8/6.8.0-1038.41~22.04.1

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 710 bytes
Desc: not available
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20250919/8bc91b49/attachment.sig>