========================================================================== Ubuntu Security Notice USN-8615-1 July 28, 2026
linux, linux-aws, linux-aws-5.4, 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-hwe-5.4, linux-iot, 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-oracle: Linux kernel for Oracle Cloud systems
- linux-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- 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:
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (CVE-2026-43503)
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:
- InfiniBand drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- Network file system (NFS) server daemon;
- SMB network file system;
- Tracing infrastructure;
- B.A.T.M.A.N. meshing protocol;
- Ethernet bridge;
- Ceph Core library;
- IPv4 networking;
- IPv6 networking;
- Netfilter;
- RxRPC session sockets;
- X.25 network layer;
(CVE-2026-23272, CVE-2026-23455, CVE-2026-31402, CVE-2026-31418,
CVE-2026-31607, CVE-2026-31637, CVE-2026-31649, CVE-2026-31659,
CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,
CVE-2026-43038, CVE-2026-43117, CVE-2026-43383, CVE-2026-43407,
CVE-2026-43414, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119,
CVE-2026-46135, CVE-2026-46243)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
linux-image-5.4.0-1065-iot 5.4.0-1065.68
Available with Ubuntu Pro
linux-image-5.4.0-1079-xilinx-zynqmp 5.4.0-1079.83
Available with Ubuntu Pro
linux-image-5.4.0-1120-bluefield 5.4.0-1120.127
Available with Ubuntu Pro
linux-image-5.4.0-1135-fips 5.4.0-1135.145
Available with Ubuntu Pro
linux-image-5.4.0-1159-oracle 5.4.0-1159.169
Available with Ubuntu Pro
linux-image-5.4.0-1161-aws 5.4.0-1161.172
Available with Ubuntu Pro
linux-image-5.4.0-1161-aws-fips 5.4.0-1161.172+fips1
Available with Ubuntu Pro
linux-image-5.4.0-1164-gcp 5.4.0-1164.173
Available with Ubuntu Pro
linux-image-5.4.0-1164-gcp-fips 5.4.0-1164.173+fips1
Available with Ubuntu Pro
linux-image-5.4.0-1166-azure 5.4.0-1166.172
Available with Ubuntu Pro
linux-image-5.4.0-1166-azure-fips 5.4.0-1166.172+fips1
Available with Ubuntu Pro
linux-image-5.4.0-233-generic 5.4.0-233.253
Available with Ubuntu Pro
linux-image-5.4.0-233-generic-lpae 5.4.0-233.253
Available with Ubuntu Pro
linux-image-5.4.0-233-lowlatency 5.4.0-233.253
Available with Ubuntu Pro
linux-image-aws-5.4 5.4.0.1161.159
Available with Ubuntu Pro
linux-image-aws-fips 5.4.0.1161.108
Available with Ubuntu Pro
linux-image-aws-fips-5.4 5.4.0.1161.108
Available with Ubuntu Pro
linux-image-aws-lts-20.04 5.4.0.1161.159
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1166.158
Available with Ubuntu Pro
linux-image-azure-fips 5.4.0.1166.102
Available with Ubuntu Pro
linux-image-azure-fips-5.4 5.4.0.1166.102
Available with Ubuntu Pro
linux-image-azure-lts-20.04 5.4.0.1166.158
Available with Ubuntu Pro
linux-image-bluefield 5.4.0.1120.116
Available with Ubuntu Pro
linux-image-bluefield-5.4 5.4.0.1120.116
Available with Ubuntu Pro
linux-image-fips 5.4.0.1135.132
Available with Ubuntu Pro
linux-image-fips-5.4 5.4.0.1135.132
Available with Ubuntu Pro
linux-image-gcp-5.4 5.4.0.1164.166
Available with Ubuntu Pro
linux-image-gcp-fips 5.4.0.1164.106
Available with Ubuntu Pro
linux-image-gcp-fips-5.4 5.4.0.1164.106
Available with Ubuntu Pro
linux-image-gcp-lts-20.04 5.4.0.1164.166
Available with Ubuntu Pro
linux-image-generic 5.4.0.233.225
Available with Ubuntu Pro
linux-image-generic-5.4 5.4.0.233.225
Available with Ubuntu Pro
linux-image-generic-lpae 5.4.0.233.225
Available with Ubuntu Pro
linux-image-generic-lpae-5.4 5.4.0.233.225
Available with Ubuntu Pro
linux-image-lowlatency 5.4.0.233.225
Available with Ubuntu Pro
linux-image-lowlatency-5.4 5.4.0.233.225
Available with Ubuntu Pro
linux-image-oem 5.4.0.233.225
Available with Ubuntu Pro
linux-image-oem-osp1 5.4.0.233.225
Available with Ubuntu Pro
linux-image-oracle-5.4 5.4.0.1159.153
Available with Ubuntu Pro
linux-image-oracle-lts-20.04 5.4.0.1159.153
Available with Ubuntu Pro
linux-image-virtual 5.4.0.233.225
Available with Ubuntu Pro
linux-image-virtual-5.4 5.4.0.233.225
Available with Ubuntu Pro
linux-image-xilinx-zynqmp 5.4.0.1079.79
Available with Ubuntu Pro
linux-image-xilinx-zynqmp-5.4 5.4.0.1079.79
Available with Ubuntu Pro
Ubuntu 18.04 LTS
linux-image-5.4.0-1159-oracle 5.4.0-1159.169~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-1161-aws 5.4.0-1161.172~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-1164-gcp 5.4.0-1164.173~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-1166-azure 5.4.0-1166.172~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-233-generic 5.4.0-233.253~18.04.1
Available with Ubuntu Pro
linux-image-5.4.0-233-lowlatency 5.4.0-233.253~18.04.1
Available with Ubuntu Pro
linux-image-aws 5.4.0.1161.172~18.04.1
Available with Ubuntu Pro
linux-image-aws-5.4 5.4.0.1161.172~18.04.1
Available with Ubuntu Pro
linux-image-azure 5.4.0.1166.172~18.04.1
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1166.172~18.04.1
Available with Ubuntu Pro
linux-image-gcp 5.4.0.1164.173~18.04.1
Available with Ubuntu Pro
linux-image-gcp-5.4 5.4.0.1164.173~18.04.1
Available with Ubuntu Pro
linux-image-generic-5.4 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-18.04 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-lowlatency-5.4 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-18.04 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-oem 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-oem-osp1 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-oracle 5.4.0.1159.169~18.04.1
Available with Ubuntu Pro
linux-image-oracle-5.4 5.4.0.1159.169~18.04.1
Available with Ubuntu Pro
linux-image-snapdragon-5.4 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-snapdragon-hwe-18.04 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-virtual-5.4 5.4.0.233.253~18.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-18.04 5.4.0.233.253~18.04.1
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-8615-1
CVE-2026-23272, CVE-2026-23455, CVE-2026-31402, CVE-2026-31418,
CVE-2026-31607, CVE-2026-31637, CVE-2026-31649, CVE-2026-31659,
CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,
CVE-2026-43038, CVE-2026-43117, CVE-2026-43383, CVE-2026-43407,
CVE-2026-43414, CVE-2026-43503, CVE-2026-45988, CVE-2026-46043,
CVE-2026-46119, CVE-2026-46135, CVE-2026-46243
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