========================================================================== Ubuntu Security Notice USN-8529-2 August 13, 2026
linux-azure, linux-gcp, linux-hwe, linux-oracle vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oracle: 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;
- SCSI subsystem;
- Thermal drivers;
- 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;
- DCCP (Datagram Congestion Control Protocol);
- IPv4 networking;
- IPv6 networking;
- Netfilter;
- RxRPC session sockets;
- X.25 network layer;
(CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455,
CVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659,
CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,
CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414,
CVE-2026-45988, CVE-2026-46043, CVE-2026-46119, CVE-2026-46243)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS
linux-image-4.15.0-1156-oracle 4.15.0-1156.167~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-1188-gcp 4.15.0-1188.205~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-1205-azure 4.15.0-1205.220~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-253-generic 4.15.0-253.265~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-254-generic 4.15.0-254.266~16.04.1
Available with Ubuntu Pro
linux-image-4.15.0-254-lowlatency 4.15.0-254.266~16.04.1
Available with Ubuntu Pro
linux-image-azure 4.15.0.1205.220~16.04.1
Available with Ubuntu Pro
linux-image-gcp 4.15.0.1188.205~16.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-16.04 4.15.0.254.266~16.04.1
Available with Ubuntu Pro
linux-image-gke 4.15.0.1188.205~16.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-16.04 4.15.0.254.266~16.04.1
Available with Ubuntu Pro
linux-image-oem 4.15.0.254.266~16.04.1
Available with Ubuntu Pro
linux-image-oracle 4.15.0.1156.167~16.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-16.04 4.15.0.254.266~16.04.1
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-8529-2
https://ubuntu.com/security/notices/USN-8529-1
CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455,
CVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659,
CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,
CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414,
CVE-2026-43503, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119,
CVE-2026-46243
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