Home / mailings [USN-8851-1] Linux kernel vulnerabilities
Posted on 30 September 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8851-1
September 30, 2026
linux, linux-aws, linux-azure, linux-fips, linux-gcp, linux-gcp-5.4,
linux-gcp-fips, linux-hwe-5.4, linux-iot, linux-kvm, linux-oracle,
linux-oracle-5.4, linux-raspi, linux-xilinx-zynqmp vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 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-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-fips: Linux kernel with FIPS
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS
- linux-iot: Linux kernel for IoT platforms
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-oracle-5.4: Linux kernel for Oracle 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:
- Network file system (NFS) server daemon;
- IPv6 networking;
- Netfilter;
(CVE-2025-38724, CVE-2026-53131, CVE-2026-53221)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
linux-image-5.4.0-1068-iot 5.4.0-1068.71
Available with Ubuntu Pro
linux-image-5.4.0-1082-xilinx-zynqmp 5.4.0-1082.86
Available with Ubuntu Pro
linux-image-5.4.0-1138-fips 5.4.0-1138.148
Available with Ubuntu Pro
linux-image-5.4.0-1147-raspi 5.4.0-1147.160
Available with Ubuntu Pro
linux-image-5.4.0-1151-kvm 5.4.0-1151.160
Available with Ubuntu Pro
linux-image-5.4.0-1162-oracle 5.4.0-1162.172
Available with Ubuntu Pro
linux-image-5.4.0-1164-aws 5.4.0-1164.175
Available with Ubuntu Pro
linux-image-5.4.0-1167-gcp 5.4.0-1167.177
Available with Ubuntu Pro
linux-image-5.4.0-1167-gcp-fips 5.4.0-1167.176+fips1
Available with Ubuntu Pro
linux-image-5.4.0-1169-azure 5.4.0-1169.175
Available with Ubuntu Pro
linux-image-5.4.0-241-generic 5.4.0-241.261
Available with Ubuntu Pro
linux-image-5.4.0-241-generic-lpae 5.4.0-241.261
Available with Ubuntu Pro
linux-image-5.4.0-241-lowlatency 5.4.0-241.261
Available with Ubuntu Pro
linux-image-aws-5.4 5.4.0.1164.162
Available with Ubuntu Pro
linux-image-aws-lts-20.04 5.4.0.1164.162
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1169.161
Available with Ubuntu Pro
linux-image-azure-lts-20.04 5.4.0.1169.161
Available with Ubuntu Pro
linux-image-fips 5.4.0.1138.135
Available with Ubuntu Pro
linux-image-fips-5.4 5.4.0.1138.135
Available with Ubuntu Pro
linux-image-gcp-5.4 5.4.0.1167.170
Available with Ubuntu Pro
linux-image-gcp-fips 5.4.0.1167.109
Available with Ubuntu Pro
linux-image-gcp-fips-5.4 5.4.0.1167.109
Available with Ubuntu Pro
linux-image-gcp-lts-20.04 5.4.0.1167.170
Available with Ubuntu Pro
linux-image-generic 5.4.0.241.233
Available with Ubuntu Pro
linux-image-generic-5.4 5.4.0.241.233
Available with Ubuntu Pro
linux-image-generic-lpae 5.4.0.241.233
Available with Ubuntu Pro
linux-image-generic-lpae-5.4 5.4.0.241.233
Available with Ubuntu Pro
linux-image-kvm 5.4.0.1151.147
Available with Ubuntu Pro
linux-image-kvm-5.4 5.4.0.1151.147
Available with Ubuntu Pro
linux-image-lowlatency 5.4.0.241.233
Available with Ubuntu Pro
linux-image-lowlatency-5.4 5.4.0.241.233
Available with Ubuntu Pro
linux-image-oem 5.4.0.241.233
Available with Ubuntu Pro
linux-image-oem-osp1 5.4.0.241.233
Available with Ubuntu Pro
linux-image-oracle-5.4 5.4.0.1162.156
Available with Ubuntu Pro
linux-image-oracle-lts-20.04 5.4.0.1162.156
Available with Ubuntu Pro
linux-image-raspi 5.4.0.1147.178
Available with Ubuntu Pro
linux-image-raspi-5.4 5.4.0.1147.178
Available with Ubuntu Pro
linux-image-raspi2 5.4.0.1147.178
Available with Ubuntu Pro
linux-image-virtual 5.4.0.241.233
Available with Ubuntu Pro
linux-image-virtual-5.4 5.4.0.241.233
Available with Ubuntu Pro
linux-image-xilinx-zynqmp 5.4.0.1082.82
Available with Ubuntu Pro
linux-image-xilinx-zynqmp-5.4 5.4.0.1082.82
Available with Ubuntu Pro
Ubuntu 18.04 LTS
linux-image-5.4.0-1162-oracle 5.4.0-1162.172~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-1167-gcp 5.4.0-1167.176~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-241-generic 5.4.0-241.261~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-241-lowlatency 5.4.0-241.261~18.04.1
Available with Ubuntu Pro
linux-image-gcp 5.4.0.1167.176~18.04.1
Available with Ubuntu Pro
linux-image-gcp-5.4 5.4.0.1167.176~18.04.1
Available with Ubuntu Pro
linux-image-generic-5.4 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-18.04 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-lowlatency-5.4 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-18.04 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-oem 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-oem-osp1 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-oracle 5.4.0.1162.172~18.04.1
Available with Ubuntu Pro
linux-image-oracle-5.4 5.4.0.1162.172~18.04.1
Available with Ubuntu Pro
linux-image-snapdragon-5.4 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-snapdragon-hwe-18.04 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-virtual-5.4 5.4.0.241.261~18.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-18.04 5.4.0.241.261~18.04.1
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-8851-1
CVE-2025-38724, CVE-2026-53131, CVE-2026-53221
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