1. Ubuntu Security Notices
  2. USN-8921-1

USN-8921-1: Linux kernel vulnerabilities

Publication date

13 October 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-fips - Linux kernel for Amazon Web Services (AWS) systems with FIPS
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-fips - Linux kernel for Microsoft Azure Cloud systems with FIPS
  • linux-fips - Linux kernel with FIPS
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-fips - Linux kernel for Google Cloud Platform (GCP) systems with FIPS
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments

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:

  • S390 architecture;
  • IIO ADC drivers;
  • Multiple devices driver;
  • PCI subsystem;
  • VFIO drivers;
  • Network file system (NFS) server daemon;
  • Overlay file system

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:

  • S390 architecture;
  • IIO ADC drivers;
  • Multiple devices driver;
  • PCI subsystem;
  • VFIO drivers;
  • Network file system (NFS) server daemon;
  • Overlay file system

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
18.04 LTS bionic linux-image-4.15.0-1153-fips –  4.15.0-1153.165  
linux-image-4.15.0-1180-kvm –  4.15.0-1180.185  
linux-image-4.15.0-1191-gcp –  4.15.0-1191.208  
linux-image-4.15.0-1198-aws –  4.15.0-1198.211  
linux-image-4.15.0-1208-azure –  4.15.0-1208.223  
linux-image-4.15.0-2099-gcp-fips –  4.15.0-2099.105  
linux-image-4.15.0-2116-azure-fips –  4.15.0-2116.122  
linux-image-4.15.0-2136-aws-fips –  4.15.0-2136.142  
linux-image-4.15.0-261-generic –  4.15.0-261.273  
linux-image-4.15.0-261-lowlatency –  4.15.0-261.273  
linux-image-aws-4.15 –  4.15.0.1198.196  
linux-image-aws-fips –  4.15.0.2136.130  
linux-image-aws-fips-4.15 –  4.15.0.2136.130  
linux-image-aws-lts-18.04 –  4.15.0.1198.196  
linux-image-azure-4.15 –  4.15.0.1208.176  
linux-image-azure-fips –  4.15.0.2116.112  
linux-image-azure-fips-4.15 –  4.15.0.2116.112  
linux-image-azure-lts-18.04 –  4.15.0.1208.176  
linux-image-fips –  4.15.0.1153.151  
linux-image-gcp-4.15 –  4.15.0.1191.204  
linux-image-gcp-fips –  4.15.0.2099.97  
linux-image-gcp-fips-4.15 –  4.15.0.2099.97  
linux-image-gcp-lts-18.04 –  4.15.0.1191.204  
linux-image-generic –  4.15.0.261.245  
linux-image-kvm –  4.15.0.1180.171  
linux-image-lowlatency –  4.15.0.261.245  
linux-image-virtual –  4.15.0.261.245  
16.04 LTS xenial linux-image-4.15.0-1191-gcp –  4.15.0-1191.208~16.04.1  
linux-image-4.15.0-1198-aws –  4.15.0-1198.211~16.04.1  
linux-image-4.15.0-261-generic –  4.15.0-261.273~16.04.1  
linux-image-4.15.0-261-lowlatency –  4.15.0-261.273~16.04.1  
linux-image-aws-hwe –  4.15.0.1198.211~16.04.1  
linux-image-gcp –  4.15.0.1191.208~16.04.1  
linux-image-generic-hwe-16.04 –  4.15.0.261.273~16.04.1  
linux-image-gke –  4.15.0.1191.208~16.04.1  
linux-image-lowlatency-hwe-16.04 –  4.15.0.261.273~16.04.1  
linux-image-oem –  4.15.0.261.273~16.04.1  
linux-image-virtual-hwe-16.04 –  4.15.0.261.273~16.04.1  
14.04 LTS trusty linux-image-4.15.0-1208-azure –  4.15.0-1208.223~14.04.1  
linux-image-azure –  4.15.0.1208.223~14.04.1  

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References

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