==========================================================================
Ubuntu Security Notice USN-7758-1
September 19, 2025

linux, linux-aws, linux-gcp, linux-gke, linux-gkeop, linux-hwe-6.8,
linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oracle 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: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-lowlatency: Linux low latency kernel
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-hwe-6.8: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-6.8: Linux low latency kernel

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-6.8.0-1022-gkeop    6.8.0-1022.24
  linux-image-6.8.0-1035-gke      6.8.0-1035.39
  linux-image-6.8.0-1035-oracle   6.8.0-1035.36
  linux-image-6.8.0-1035-oracle-64k  6.8.0-1035.36
  linux-image-6.8.0-1038-aws      6.8.0-1038.40
  linux-image-6.8.0-1038-aws-64k  6.8.0-1038.40
  linux-image-6.8.0-1039-gcp      6.8.0-1039.41
  linux-image-6.8.0-1039-gcp-64k  6.8.0-1039.41
  linux-image-6.8.0-83-generic    6.8.0-83.83
  linux-image-6.8.0-83-generic-64k  6.8.0-83.83
  linux-image-6.8.0-83-lowlatency  6.8.0-83.83.1
  linux-image-6.8.0-83-lowlatency-64k  6.8.0-83.83.1
  linux-image-aws-6.8             6.8.0-1038.40
  linux-image-aws-64k-6.8         6.8.0-1038.40
  linux-image-aws-64k-lts-24.04   6.8.0-1038.40
  linux-image-aws-lts-24.04       6.8.0-1038.40
  linux-image-gcp-6.8             6.8.0-1039.41
  linux-image-gcp-64k-6.8         6.8.0-1039.41
  linux-image-gcp-64k-lts-24.04   6.8.0-1039.41
  linux-image-gcp-lts-24.04       6.8.0-1039.41
  linux-image-generic             6.8.0-83.83
  linux-image-generic-6.8         6.8.0-83.83
  linux-image-generic-64k         6.8.0-83.83
  linux-image-generic-64k-6.8     6.8.0-83.83
  linux-image-generic-lpae        6.8.0-83.83
  linux-image-gke                 6.8.0-1035.39
  linux-image-gke-6.8             6.8.0-1035.39
  linux-image-gkeop               6.8.0-1022.24
  linux-image-gkeop-6.8           6.8.0-1022.24
  linux-image-kvm                 6.8.0-83.83
  linux-image-lowlatency          6.8.0-83.83.1
  linux-image-lowlatency-6.8      6.8.0-83.83.1
  linux-image-lowlatency-64k      6.8.0-83.83.1
  linux-image-lowlatency-64k-6.8  6.8.0-83.83.1
  linux-image-oracle-6.8          6.8.0-1035.36
  linux-image-oracle-64k-6.8      6.8.0-1035.36
  linux-image-oracle-64k-lts-24.04  6.8.0-1035.36
  linux-image-oracle-lts-24.04    6.8.0-1035.36
  linux-image-virtual             6.8.0-83.83
  linux-image-virtual-6.8         6.8.0-83.83

Ubuntu 22.04 LTS
  linux-image-6.8.0-83-generic    6.8.0-83.83~22.04.1
  linux-image-6.8.0-83-generic-64k  6.8.0-83.83~22.04.1
  linux-image-6.8.0-83-lowlatency  6.8.0-83.83.1~22.04.1
  linux-image-6.8.0-83-lowlatency-64k  6.8.0-83.83.1~22.04.1
  linux-image-generic-6.8         6.8.0-83.83~22.04.1
  linux-image-generic-64k-6.8     6.8.0-83.83~22.04.1
  linux-image-generic-64k-hwe-22.04  6.8.0-83.83~22.04.1
  linux-image-generic-hwe-22.04   6.8.0-83.83~22.04.1
  linux-image-lowlatency-6.8      6.8.0-83.83.1~22.04.1
  linux-image-lowlatency-64k-6.8  6.8.0-83.83.1~22.04.1
  linux-image-lowlatency-64k-hwe-22.04  6.8.0-83.83.1~22.04.1
  linux-image-lowlatency-hwe-22.04  6.8.0-83.83.1~22.04.1
  linux-image-oem-22.04           6.8.0-83.83~22.04.1
  linux-image-oem-22.04a          6.8.0-83.83~22.04.1
  linux-image-oem-22.04b          6.8.0-83.83~22.04.1
  linux-image-oem-22.04c          6.8.0-83.83~22.04.1
  linux-image-oem-22.04d          6.8.0-83.83~22.04.1
  linux-image-virtual-6.8         6.8.0-83.83~22.04.1
  linux-image-virtual-hwe-22.04   6.8.0-83.83~22.04.1

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-7758-1
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2121515

Package Information:
  
  
  
  
  https://launchpad.net/ubuntu/+source/linux-gkeop/6.8.0-1022.24
  
  
  https://launchpad.net/ubuntu/+source/linux-hwe-6.8/6.8.0-83.83~22.04.1