Ubuntu Security Notices
USN-8666-1

USN-8666-1: Linux kernel vulnerabilities

Publication date

20 August 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

20.04 LTS 18.04 LTS

Packages

linux - Linux kernel
linux-aws - Linux kernel for Amazon Web Services (AWS) systems
linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
linux-azure - Linux kernel for Microsoft Azure Cloud systems
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-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
linux-ibm - Linux kernel for IBM cloud systems
linux-ibm-5.4 - Linux kernel for IBM cloud systems
linux-iot - Linux kernel for IoT platforms
linux-oracle - Linux kernel for Oracle Cloud systems
linux-raspi - Linux kernel for Raspberry Pi systems
linux-raspi-5.4 - Linux kernel for Raspberry Pi systems
linux-xilinx-zynqmp - Linux kernel for Xilinx ZynqMP processors

Details

Siebe Devroe, Héloïse Gollier, and Mathy Vanhoef discovered that the WiFi
implementation in the Linux kernel did not properly handle aggregated
frames in mesh networks, due to an incorrect fix for CVE-2020-24588. A
physically proximate attacker could use this issue to inject packets.
(CVE-2025-27558)

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:

x86 architecture;
Cryptographic API;
InfiniBand drivers;
Media drivers;
NVIDIA Tegra memory controller driver;
Network drivers;
NVME drivers;
File systems infrastructure;
Ext4 file system;
IPv4 networking;
Network traffic control;
TCP network protocol;
Locking...

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:

x86 architecture;
Cryptographic API;
InfiniBand drivers;
Media drivers;
NVIDIA Tegra memory controller driver;
Network drivers;
NVME drivers;
File systems infrastructure;
Ext4 file system;
IPv4 networking;
Network traffic control;
TCP network protocol;
Locking primitives;
B.A.T.M.A.N. meshing protocol;
Ceph Core library;
IPv6 networking;
Multipath TCP;
Netfilter;
SCTP protocol;
SMC sockets;
TIPC protocol

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release	Package Version
20.04 LTS focal	linux-image-5.4.0-1066-iot – 5.4.0-1066.69
	linux-image-5.4.0-1080-xilinx-zynqmp – 5.4.0-1080.84
	linux-image-5.4.0-1108-ibm – 5.4.0-1108.113
	linux-image-5.4.0-1121-bluefield – 5.4.0-1121.128
	linux-image-5.4.0-1136-fips – 5.4.0-1136.146
	linux-image-5.4.0-1145-raspi – 5.4.0-1145.158
	linux-image-5.4.0-1160-oracle – 5.4.0-1160.170
	linux-image-5.4.0-1162-aws – 5.4.0-1162.173
	linux-image-5.4.0-1165-gcp – 5.4.0-1165.174
	linux-image-5.4.0-1167-azure – 5.4.0-1167.173
	linux-image-5.4.0-234-generic – 5.4.0-234.254
	linux-image-5.4.0-234-generic-lpae – 5.4.0-234.254
	linux-image-5.4.0-234-lowlatency – 5.4.0-234.254
	linux-image-aws-5.4 – 5.4.0.1162.160
	linux-image-aws-lts-20.04 – 5.4.0.1162.160
	linux-image-azure-5.4 – 5.4.0.1167.159
	linux-image-azure-lts-20.04 – 5.4.0.1167.159
	linux-image-bluefield – 5.4.0.1121.117
	linux-image-bluefield-5.4 – 5.4.0.1121.117
	linux-image-fips – 5.4.0.1136.133
	linux-image-fips-5.4 – 5.4.0.1136.133
	linux-image-gcp-5.4 – 5.4.0.1165.167
	linux-image-gcp-lts-20.04 – 5.4.0.1165.167
	linux-image-generic – 5.4.0.234.226
	linux-image-generic-5.4 – 5.4.0.234.226
	linux-image-generic-lpae – 5.4.0.234.226
	linux-image-generic-lpae-5.4 – 5.4.0.234.226
	linux-image-ibm-5.4 – 5.4.0.1108.137
	linux-image-ibm-lts-20.04 – 5.4.0.1108.137
	linux-image-lowlatency – 5.4.0.234.226
	linux-image-lowlatency-5.4 – 5.4.0.234.226
	linux-image-oem – 5.4.0.234.226
	linux-image-oem-osp1 – 5.4.0.234.226
	linux-image-oracle-5.4 – 5.4.0.1160.154
	linux-image-oracle-lts-20.04 – 5.4.0.1160.154
	linux-image-raspi – 5.4.0.1145.176
	linux-image-raspi-5.4 – 5.4.0.1145.176
	linux-image-raspi2 – 5.4.0.1145.176
	linux-image-virtual – 5.4.0.234.226
	linux-image-virtual-5.4 – 5.4.0.234.226
	linux-image-xilinx-zynqmp – 5.4.0.1080.80
	linux-image-xilinx-zynqmp-5.4 – 5.4.0.1080.80
18.04 LTS bionic	linux-image-5.4.0-1108-ibm – 5.4.0-1108.113~18.04.1
	linux-image-5.4.0-1145-raspi – 5.4.0-1145.158~18.04.1
	linux-image-5.4.0-1162-aws – 5.4.0-1162.173~18.04.1
	linux-image-5.4.0-1165-gcp – 5.4.0-1165.174~18.04.1
	linux-image-5.4.0-234-generic – 5.4.0-234.254~18.04.1
	linux-image-5.4.0-234-lowlatency – 5.4.0-234.254~18.04.1
	linux-image-aws – 5.4.0.1162.173~18.04.1
	linux-image-aws-5.4 – 5.4.0.1162.173~18.04.1
	linux-image-gcp – 5.4.0.1165.174~18.04.1
	linux-image-gcp-5.4 – 5.4.0.1165.174~18.04.1
	linux-image-generic-5.4 – 5.4.0.234.254~18.04.1
	linux-image-generic-hwe-18.04 – 5.4.0.234.254~18.04.1
	linux-image-ibm – 5.4.0.1108.113~18.04.1
	linux-image-ibm-5.4 – 5.4.0.1108.113~18.04.1
	linux-image-lowlatency-5.4 – 5.4.0.234.254~18.04.1
	linux-image-lowlatency-hwe-18.04 – 5.4.0.234.254~18.04.1
	linux-image-oem – 5.4.0.234.254~18.04.1
	linux-image-oem-osp1 – 5.4.0.234.254~18.04.1
	linux-image-raspi-5.4 – 5.4.0.1145.158~18.04.1
	linux-image-raspi-hwe-18.04 – 5.4.0.1145.158~18.04.1
	linux-image-snapdragon-5.4 – 5.4.0.234.254~18.04.1
	linux-image-snapdragon-hwe-18.04 – 5.4.0.234.254~18.04.1
	linux-image-virtual-5.4 – 5.4.0.234.254~18.04.1
	linux-image-virtual-hwe-18.04 – 5.4.0.234.254~18.04.1