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Alerts This Week
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Ubuntu 24.04 LTS: USN-7758-2 Linux Kernel Critical Denial of Service

ubuntu
Calendar Grey September 19, 2025
Dist Ubuntu Esm H88
Ubuntu Security Alert USN-7758-2 highlights a significant denial of service vulnerability impacting the Linux kernel within Ubuntu.
The system could be made to crash or run programs as an administrator.

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.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu system crash linux-ibm

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://bugs.launchpad.net/ubuntu/+source/linux/+bug/2121515

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7758-2

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu system crash linux-ibm

Package Information

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

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