========================================================================== Ubuntu Security Notice USN-8389-1 June 04, 2026
linux, linux-aws, linux-aws-fips, linux-azure, linux-azure-5.4, linux-azure-fips, linux-bluefield, linux-fips, linux-gcp, linux-gcp-5.4, linux-gcp-fips, linux-iot, linux-kvm, linux-oracle, linux-oracle-5.4, 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-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS - linux-bluefield: Linux kernel for NVIDIA BlueField platforms - 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-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
Details:
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500)
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:
- RDS protocol;
(CVE-2026-43494)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
linux-image-5.4.0-1064-iot 5.4.0-1064.67
Available with Ubuntu Pro
linux-image-5.4.0-1078-xilinx-zynqmp 5.4.0-1078.82
Available with Ubuntu Pro
linux-image-5.4.0-1119-bluefield 5.4.0-1119.126
Available with Ubuntu Pro
linux-image-5.4.0-1134-fips 5.4.0-1134.144
Available with Ubuntu Pro
linux-image-5.4.0-1147-kvm 5.4.0-1147.156
Available with Ubuntu Pro
linux-image-5.4.0-1158-oracle 5.4.0-1158.168
Available with Ubuntu Pro
linux-image-5.4.0-1160-aws 5.4.0-1160.170
Available with Ubuntu Pro
linux-image-5.4.0-1160-aws-fips 5.4.0-1160.170+fips1
Available with Ubuntu Pro
linux-image-5.4.0-1163-gcp 5.4.0-1163.172
Available with Ubuntu Pro
linux-image-5.4.0-1163-gcp-fips 5.4.0-1163.172+fips1
Available with Ubuntu Pro
linux-image-5.4.0-1164-azure 5.4.0-1164.170
Available with Ubuntu Pro
linux-image-5.4.0-1164-azure-fips 5.4.0-1164.170+fips1
Available with Ubuntu Pro
linux-image-5.4.0-231-generic 5.4.0-231.251
Available with Ubuntu Pro
linux-image-5.4.0-231-generic-lpae 5.4.0-231.251
Available with Ubuntu Pro
linux-image-5.4.0-231-lowlatency 5.4.0-231.251
Available with Ubuntu Pro
linux-image-aws-5.4 5.4.0.1160.157
Available with Ubuntu Pro
linux-image-aws-fips 5.4.0.1160.107
Available with Ubuntu Pro
linux-image-aws-fips-5.4 5.4.0.1160.107
Available with Ubuntu Pro
linux-image-aws-lts-20.04 5.4.0.1160.157
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1164.156
Available with Ubuntu Pro
linux-image-azure-fips 5.4.0.1164.100
Available with Ubuntu Pro
linux-image-azure-fips-5.4 5.4.0.1164.100
Available with Ubuntu Pro
linux-image-azure-lts-20.04 5.4.0.1164.156
Available with Ubuntu Pro
linux-image-bluefield 5.4.0.1119.115
Available with Ubuntu Pro
linux-image-bluefield-5.4 5.4.0.1119.115
Available with Ubuntu Pro
linux-image-fips 5.4.0.1134.131
Available with Ubuntu Pro
linux-image-fips-5.4 5.4.0.1134.131
Available with Ubuntu Pro
linux-image-gcp-5.4 5.4.0.1163.165
Available with Ubuntu Pro
linux-image-gcp-fips 5.4.0.1163.105
Available with Ubuntu Pro
linux-image-gcp-fips-5.4 5.4.0.1163.105
Available with Ubuntu Pro
linux-image-gcp-lts-20.04 5.4.0.1163.165
Available with Ubuntu Pro
linux-image-generic 5.4.0.231.223
Available with Ubuntu Pro
linux-image-generic-5.4 5.4.0.231.223
Available with Ubuntu Pro
linux-image-generic-lpae 5.4.0.231.223
Available with Ubuntu Pro
linux-image-generic-lpae-5.4 5.4.0.231.223
Available with Ubuntu Pro
linux-image-kvm 5.4.0.1147.143
Available with Ubuntu Pro
linux-image-kvm-5.4 5.4.0.1147.143
Available with Ubuntu Pro
linux-image-lowlatency 5.4.0.231.223
Available with Ubuntu Pro
linux-image-lowlatency-5.4 5.4.0.231.223
Available with Ubuntu Pro
linux-image-oem 5.4.0.231.223
Available with Ubuntu Pro
linux-image-oem-osp1 5.4.0.231.223
Available with Ubuntu Pro
linux-image-oracle-5.4 5.4.0.1158.152
Available with Ubuntu Pro
linux-image-oracle-lts-20.04 5.4.0.1158.152
Available with Ubuntu Pro
linux-image-virtual 5.4.0.231.223
Available with Ubuntu Pro
linux-image-virtual-5.4 5.4.0.231.223
Available with Ubuntu Pro
linux-image-xilinx-zynqmp 5.4.0.1078.78
Available with Ubuntu Pro
linux-image-xilinx-zynqmp-5.4 5.4.0.1078.78
Available with Ubuntu Pro
Ubuntu 18.04 LTS
linux-image-5.4.0-1158-oracle 5.4.0-1158.168~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-1163-gcp 5.4.0-1163.172~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-1164-azure 5.4.0-1164.170~18.04.1
Available with Ubuntu Pro
linux-image-azure 5.4.0.1164.170~18.04.1
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1164.170~18.04.1
Available with Ubuntu Pro
linux-image-gcp 5.4.0.1163.172~18.04.1
Available with Ubuntu Pro
linux-image-gcp-5.4 5.4.0.1163.172~18.04.1
Available with Ubuntu Pro
linux-image-oracle 5.4.0.1158.168~18.04.1
Available with Ubuntu Pro
linux-image-oracle-5.4 5.4.0.1158.168~18.04.1
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-8389-1
CVE-2026-43284, CVE-2026-43494, CVE-2026-43500
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