Home / mailings [USN-8266-1] Linux kernel vulnerabilities
Posted on 11 May 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8266-1
May 11, 2026
linux, linux-aws, linux-aws-fips, linux-aws-hwe, linux-azure-4.15,
linux-fips, linux-gcp, linux-gcp-4.15, linux-gcp-fips, linux-hwe,
linux-kvm, linux-oracle vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 16.04 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-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-oracle: Linux kernel for Oracle Cloud systems
- 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
Details:
Qualys discovered that several vulnerabilities existed in the AppArmor
Linux kernel Security Module (LSM). An unprivileged local attacker could
use these issues to load, replace, and remove arbitrary AppArmor profiles
causing denial of service, exposure of sensitive information (kernel
memory), local privilege escalation, or possibly escape a container.
(LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403,
CVE-2026-23404, CVE-2026-23405, CVE-2026-23410, CVE-2026-23411)
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:
- GPU drivers;
- Network drivers;
- Sun RPC protocol;
- XFRM subsystem;
(CVE-2024-27388, CVE-2024-46816, CVE-2024-49938, CVE-2024-50008,
CVE-2024-50142, CVE-2026-23209)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1146-fips 4.15.0-1146.158
Available with Ubuntu Pro
linux-image-4.15.0-1153-oracle 4.15.0-1153.164
Available with Ubuntu Pro
linux-image-4.15.0-1173-kvm 4.15.0-1173.178
Available with Ubuntu Pro
linux-image-4.15.0-1184-gcp 4.15.0-1184.201
Available with Ubuntu Pro
linux-image-4.15.0-1191-aws 4.15.0-1191.204
Available with Ubuntu Pro
linux-image-4.15.0-1200-azure 4.15.0-1200.215
Available with Ubuntu Pro
linux-image-4.15.0-2092-gcp-fips 4.15.0-2092.98
Available with Ubuntu Pro
linux-image-4.15.0-2129-aws-fips 4.15.0-2129.135
Available with Ubuntu Pro
linux-image-4.15.0-249-generic 4.15.0-249.261
Available with Ubuntu Pro
linux-image-4.15.0-249-lowlatency 4.15.0-249.261
Available with Ubuntu Pro
linux-image-aws-4.15 4.15.0.1191.189
Available with Ubuntu Pro
linux-image-aws-fips 4.15.0.2129.123
Available with Ubuntu Pro
linux-image-aws-fips-4.15 4.15.0.2129.123
Available with Ubuntu Pro
linux-image-aws-lts-18.04 4.15.0.1191.189
Available with Ubuntu Pro
linux-image-azure-4.15 4.15.0.1200.168
Available with Ubuntu Pro
linux-image-azure-lts-18.04 4.15.0.1200.168
Available with Ubuntu Pro
linux-image-fips 4.15.0.1146.143
Available with Ubuntu Pro
linux-image-gcp-4.15 4.15.0.1184.197
Available with Ubuntu Pro
linux-image-gcp-fips 4.15.0.2092.90
Available with Ubuntu Pro
linux-image-gcp-fips-4.15 4.15.0.2092.90
Available with Ubuntu Pro
linux-image-gcp-lts-18.04 4.15.0.1184.197
Available with Ubuntu Pro
linux-image-generic 4.15.0.249.233
Available with Ubuntu Pro
linux-image-kvm 4.15.0.1173.164
Available with Ubuntu Pro
linux-image-lowlatency 4.15.0.249.233
Available with Ubuntu Pro
linux-image-oracle-4.15 4.15.0.1153.158
Available with Ubuntu Pro
linux-image-oracle-lts-18.04 4.15.0.1153.158
Available with Ubuntu Pro
linux-image-virtual 4.15.0.249.233
Available with Ubuntu Pro
Ubuntu 16.04 LTS
linux-image-4.15.0-1184-gcp 4.15.0-1184.201~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-1191-aws 4.15.0-1191.204~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-249-generic 4.15.0-249.261~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-249-lowlatency 4.15.0-249.261~16.04.1
Available with Ubuntu Pro
linux-image-aws-hwe 4.15.0.1191.204~16.04.1
Available with Ubuntu Pro
linux-image-gcp 4.15.0.1184.201~16.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-16.04 4.15.0.249.261~16.04.1
Available with Ubuntu Pro
linux-image-gke 4.15.0.1184.201~16.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-16.04 4.15.0.249.261~16.04.1
Available with Ubuntu Pro
linux-image-oem 4.15.0.249.261~16.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-16.04 4.15.0.249.261~16.04.1
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-8266-1
https://launchpad.net/bugs/2143853
CVE-2024-27388, CVE-2024-46816, CVE-2024-49938, CVE-2024-50008,
CVE-2024-50142, CVE-2026-23209, CVE-2026-23268, CVE-2026-23269,
CVE-2026-23403, CVE-2026-23404, CVE-2026-23405, CVE-2026-23410,
CVE-2026-23411
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