Home / mailings [USN-8818-1] Linux kernel vulnerabilities
Posted on 24 September 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8818-1
September 24, 2026
linux-aws, linux-aws-fips, linux-azure, linux-azure-fde, linux-azure-fips,
linux-gcp, linux-gcp-fips, linux-gke, linux-gkeop, linux-hwe-5.15,
linux-ibm, linux-intel-iot-realtime, linux-intel-iotg, linux-kvm,
linux-lowlatency, linux-lowlatency-hwe-5.15, linux-oracle, linux-realtime,
linux-xilinx-zynqmp vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- 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: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems 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-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-intel-iot-realtime: Linux kernel for Intel IoT Real-time platforms
- linux-intel-iotg: Linux kernel for Intel IoT platforms
- linux-kvm: Linux kernel for cloud environments
- linux-lowlatency: Linux low latency kernel
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-realtime: Linux kernel for Real-time systems
- linux-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-5.15: Linux low latency kernel
Details:
It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
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:
- ARM64 architecture;
- InfiniBand drivers;
- Network drivers;
- TCM subsystem;
- exFAT file system;
- Network file system (NFS) client;
- Network file system (NFS) server daemon;
- B.A.T.M.A.N. meshing protocol;
- IPv4 networking;
- IPv6 networking;
- Netfilter;
- RDS protocol;
(CVE-2026-53186, CVE-2026-53216, CVE-2026-53221, CVE-2026-53354,
CVE-2026-53355, CVE-2026-53398, CVE-2026-63800, CVE-2026-63808,
CVE-2026-63887, CVE-2026-63888, CVE-2026-63912, CVE-2026-63922,
CVE-2026-63924, CVE-2026-63984, CVE-2026-63992, CVE-2026-63993,
CVE-2026-63994, CVE-2026-64007, CVE-2026-64091)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
linux-image-5.15.0-1079-xilinx-zynqmp 5.15.0-1079.83
linux-image-5.15.0-1099-gkeop 5.15.0-1099.107
linux-image-5.15.0-1108-intel-iot-realtime 5.15.0-1108.110
Available with Ubuntu Pro
linux-image-5.15.0-1108-kvm 5.15.0-1108.113
linux-image-5.15.0-1110-ibm 5.15.0-1110.114
linux-image-5.15.0-1111-intel-iotg 5.15.0-1111.117
linux-image-5.15.0-1112-gke 5.15.0-1112.118
linux-image-5.15.0-1113-oracle 5.15.0-1113.119
linux-image-5.15.0-1115-realtime 5.15.0-1115.124
Available with Ubuntu Pro
linux-image-5.15.0-1116-aws 5.15.0-1116.123
linux-image-5.15.0-1116-aws-64k 5.15.0-1116.123
linux-image-5.15.0-1116-aws-fips 5.15.0-1116.123+fips1
Available with Ubuntu Pro
linux-image-5.15.0-1116-gcp-fips 5.15.0-1116.126+fips1
Available with Ubuntu Pro
linux-image-5.15.0-1117-gcp 5.15.0-1117.127
linux-image-5.15.0-1121-azure-fde 5.15.0-1121.130
linux-image-5.15.0-1122-azure 5.15.0-1122.131
linux-image-5.15.0-1122-azure-fips 5.15.0-1122.131+fips1
Available with Ubuntu Pro
linux-image-5.15.0-194-lowlatency 5.15.0-194.204
linux-image-5.15.0-194-lowlatency-64k 5.15.0-194.204
linux-image-aws-5.15 5.15.0.1116.119
linux-image-aws-64k-5.15 5.15.0.1116.119
linux-image-aws-64k-lts-22.04 5.15.0.1116.119
linux-image-aws-fips 5.15.0.1116.112
Available with Ubuntu Pro
linux-image-aws-fips-5.15 5.15.0.1116.112
Available with Ubuntu Pro
linux-image-aws-lts-22.04 5.15.0.1116.119
linux-image-azure-5.15 5.15.0.1122.120
linux-image-azure-fde-5.15 5.15.0.1121.130
linux-image-azure-fde-lts-22.04 5.15.0.1121.130
linux-image-azure-fips 5.15.0.1122.106
Available with Ubuntu Pro
linux-image-azure-fips-5.15 5.15.0.1122.106
Available with Ubuntu Pro
linux-image-azure-lts-22.04 5.15.0.1122.120
linux-image-gcp-5.15 5.15.0.1117.114
linux-image-gcp-fips 5.15.0.1116.106
Available with Ubuntu Pro
linux-image-gcp-fips-5.15 5.15.0.1116.106
Available with Ubuntu Pro
linux-image-gcp-lts-22.04 5.15.0.1117.114
linux-image-gke 5.15.0.1112.111
linux-image-gke-5.15 5.15.0.1112.111
linux-image-gkeop 5.15.0.1099.98
linux-image-gkeop-5.15 5.15.0.1099.98
linux-image-ibm 5.15.0.1110.107
linux-image-ibm-5.15 5.15.0.1110.107
linux-image-intel-iot-realtime 5.15.0.1108.112
Available with Ubuntu Pro
linux-image-intel-iot-realtime-5.15 5.15.0.1108.112
Available with Ubuntu Pro
linux-image-intel-iotg 5.15.0.1111.110
linux-image-intel-iotg-5.15 5.15.0.1111.110
linux-image-kvm 5.15.0.1108.104
linux-image-kvm-5.15 5.15.0.1108.104
linux-image-lowlatency 5.15.0.194.159
linux-image-lowlatency-5.15 5.15.0.194.159
linux-image-lowlatency-64k 5.15.0.194.159
linux-image-lowlatency-64k-5.15 5.15.0.194.159
linux-image-oracle-5.15 5.15.0.1113.109
linux-image-oracle-lts-22.04 5.15.0.1113.109
linux-image-realtime 5.15.0.1115.119
Available with Ubuntu Pro
linux-image-realtime-5.15 5.15.0.1115.119
Available with Ubuntu Pro
linux-image-xilinx-zynqmp 5.15.0.1079.82
linux-image-xilinx-zynqmp-5.15 5.15.0.1079.82
Ubuntu 20.04 LTS
linux-image-5.15.0-194-generic 5.15.0-194.204~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-194-generic-64k 5.15.0-194.204~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-194-generic-lpae 5.15.0-194.204~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-194-lowlatency 5.15.0-194.204~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-194-lowlatency-64k 5.15.0-194.204~20.04.1
Available with Ubuntu Pro
linux-image-generic-5.15 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-5.15 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-hwe-20.04 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-20.04 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-5.15 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-hwe-20.04 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-5.15 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-64k-5.15 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-64k-hwe-20.04 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-20.04 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04b 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04c 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04d 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-virtual-5.15 5.15.0.194.204~20.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-20.04 5.15.0.194.204~20.04.1
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-8818-1
CVE-2025-10263, CVE-2026-53186, CVE-2026-53216, CVE-2026-53221,
CVE-2026-53354, CVE-2026-53355, CVE-2026-53398, CVE-2026-63800,
CVE-2026-63808, CVE-2026-63887, CVE-2026-63888, CVE-2026-63912,
CVE-2026-63922, CVE-2026-63924, CVE-2026-63984, CVE-2026-63992,
CVE-2026-63993, CVE-2026-63994, CVE-2026-64007, CVE-2026-64091
Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1116.123
https://launchpad.net/ubuntu/+source/linux-aws-fips/5.15.0-1116.123+fips1
https://launchpad.net/ubuntu/+source/linux-azure/5.15.0-1122.131
https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1121.130
https://launchpad.net/ubuntu/+source/linux-azure-fips/5.15.0-1122.131+fips1
https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1117.127
https://launchpad.net/ubuntu/+source/linux-gcp-fips/5.15.0-1116.126+fips1
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1112.118
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1099.107
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1110.114
https://launchpad.net/ubuntu/+source/linux-intel-iot-realtime/5.15.0-1108.110
https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.15.0-1111.117
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1108.113
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-194.204
https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1113.119
https://launchpad.net/ubuntu/+source/linux-realtime/5.15.0-1115.124
https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.15.0-1079.83
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