Home / mailings [USN-8921-1] Linux kernel vulnerabilities
Posted on 13 October 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8921-1
October 13, 2026
linux, linux-aws, linux-aws-fips, linux-aws-hwe, linux-azure,
linux-azure-4.15, linux-azure-fips, linux-fips, linux-gcp, linux-gcp-4.15,
linux-gcp-fips, linux-hwe, linux-kvm vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- 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-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-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS
- linux-kvm: Linux kernel for cloud environments
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-azure: Linux kernel for Microsoft Azure 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:
- S390 architecture;
- IIO ADC drivers;
- Multiple devices driver;
- PCI subsystem;
- VFIO drivers;
- Network file system (NFS) server daemon;
- Overlay file system;
(CVE-2024-53194, CVE-2024-53214, CVE-2024-56570, CVE-2024-56779,
CVE-2024-57849, CVE-2024-57904, CVE-2024-57929, CVE-2025-21664)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1153-fips 4.15.0-1153.165
Available with Ubuntu Pro
linux-image-4.15.0-1180-kvm 4.15.0-1180.185
Available with Ubuntu Pro
linux-image-4.15.0-1191-gcp 4.15.0-1191.208
Available with Ubuntu Pro
linux-image-4.15.0-1198-aws 4.15.0-1198.211
Available with Ubuntu Pro
linux-image-4.15.0-1208-azure 4.15.0-1208.223
Available with Ubuntu Pro
linux-image-4.15.0-2099-gcp-fips 4.15.0-2099.105
Available with Ubuntu Pro
linux-image-4.15.0-2116-azure-fips 4.15.0-2116.122
Available with Ubuntu Pro
linux-image-4.15.0-2136-aws-fips 4.15.0-2136.142
Available with Ubuntu Pro
linux-image-4.15.0-261-generic 4.15.0-261.273
Available with Ubuntu Pro
linux-image-4.15.0-261-lowlatency 4.15.0-261.273
Available with Ubuntu Pro
linux-image-aws-4.15 4.15.0.1198.196
Available with Ubuntu Pro
linux-image-aws-fips 4.15.0.2136.130
Available with Ubuntu Pro
linux-image-aws-fips-4.15 4.15.0.2136.130
Available with Ubuntu Pro
linux-image-aws-lts-18.04 4.15.0.1198.196
Available with Ubuntu Pro
linux-image-azure-4.15 4.15.0.1208.176
Available with Ubuntu Pro
linux-image-azure-fips 4.15.0.2116.112
Available with Ubuntu Pro
linux-image-azure-fips-4.15 4.15.0.2116.112
Available with Ubuntu Pro
linux-image-azure-lts-18.04 4.15.0.1208.176
Available with Ubuntu Pro
linux-image-fips 4.15.0.1153.151
Available with Ubuntu Pro
linux-image-gcp-4.15 4.15.0.1191.204
Available with Ubuntu Pro
linux-image-gcp-fips 4.15.0.2099.97
Available with Ubuntu Pro
linux-image-gcp-fips-4.15 4.15.0.2099.97
Available with Ubuntu Pro
linux-image-gcp-lts-18.04 4.15.0.1191.204
Available with Ubuntu Pro
linux-image-generic 4.15.0.261.245
Available with Ubuntu Pro
linux-image-kvm 4.15.0.1180.171
Available with Ubuntu Pro
linux-image-lowlatency 4.15.0.261.245
Available with Ubuntu Pro
linux-image-virtual 4.15.0.261.245
Available with Ubuntu Pro
Ubuntu 16.04 LTS
linux-image-4.15.0-1191-gcp 4.15.0-1191.208~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-1198-aws 4.15.0-1198.211~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-261-generic 4.15.0-261.273~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-261-lowlatency 4.15.0-261.273~16.04.1
Available with Ubuntu Pro
linux-image-aws-hwe 4.15.0.1198.211~16.04.1
Available with Ubuntu Pro
linux-image-gcp 4.15.0.1191.208~16.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-16.04 4.15.0.261.273~16.04.1
Available with Ubuntu Pro
linux-image-gke 4.15.0.1191.208~16.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-16.04 4.15.0.261.273~16.04.1
Available with Ubuntu Pro
linux-image-oem 4.15.0.261.273~16.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-16.04 4.15.0.261.273~16.04.1
Available with Ubuntu Pro
Ubuntu 14.04 LTS
linux-image-4.15.0-1208-azure 4.15.0-1208.223~14.04.1
Available with Ubuntu Pro
linux-image-azure 4.15.0.1208.223~14.04.1
Available with Ubuntu Pro
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-8921-1
CVE-2024-53194, CVE-2024-53214, CVE-2024-56570, CVE-2024-56779,
CVE-2024-57849, CVE-2024-57904, CVE-2024-57929, CVE-2025-21664
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