Ubuntu 20.04 18.04 Linux Kernel Critical Network Threats USN-8666

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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-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-ibm: 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-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors - linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems - linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe-5.4: Linux hardware enablement (HWE) kernel - linux-ibm-5.4: Linux kernel for IBM cloud systems - linux-raspi-5.4: Linux kernel for Raspberry Pi systems Details: Siebe Devroe, Héloïse G... Read the Full Advisory

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-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-ibm: 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-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors

- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

- linux-ibm-5.4: Linux kernel for IBM cloud systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Siebe Devroe, Héloïse G...

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.4.0-1066-iot 5.4.0-1066.69 Available with Ubuntu Pro linux-image-5.4.0-1080-xilinx-zynqmp 5.4.0-1080.84 Available with Ubuntu Pro linux-image-5.4.0-1108-ibm 5.4.0-1108.113 Available with Ubuntu Pro linux-image-5.4.0-1121-bluefield 5.4.0-1121.128 Available with Ubuntu Pro linux-image-5.4.0-1136-fips 5.4.0-1136.146 Available with Ubuntu Pro linux-image-5.4.0-1145-raspi 5.4.0-1145.158 Available with Ubuntu Pro linux-image-5.4.0-1160-oracle 5.4.0-1160.170 Available with Ubuntu Pro linux-image-5.4.0-1162-aws 5.4.0-1162.173 Available with Ubuntu Pro linux-image-5.4.0-1165-gcp 5.4.0-1165.174 Available with Ubuntu Pro linux-image-5.4.0-1167-azure 5.4.0-1167.173 Available with Ubuntu Pro linux-image-5.4.0-234-generic 5.4.0-234.254 Available with Ubuntu Pro linux-image-5.4.0-234-generic-lpae 5.4.0-234.254 Available with Ubuntu Pro linux-image-5.4.0-234-lowlatency 5.4.0-234.254 Available with Ubuntu Pro linux-image-aws-5.4 5.4.0.1162.160 Available with Ubuntu Pro linux-image-aws-lts-20.04 5.4.0.1162.160 Available with Ubuntu Pro linux-image-azure-5.4 5.4.0.1167.159 Available with Ubuntu Pro linux-image-azure-lts-20.04 5.4.0.1167.159 Available with Ubuntu Pro linux-image-bluefield 5.4.0.1121.117 Available with Ubuntu Pro linux-image-bluefield-5.4 5.4.0.1121.117 Available with Ubuntu Pro linux-image-fips 5.4.0.1136.133 Available with Ubuntu Pro linux-image-fips-5.4 5.4.0.1136.133 Available with Ubuntu Pro linux-image-gcp-5.4 5.4.0.1165.167 Available with Ubuntu Pro linux-image-gcp-lts-20.04 5.4.0.1165.167 Available with Ubuntu Pro linux-image-generic 5.4.0.234.226 Available with Ubuntu Pro linux-image-generic-5.4 5.4.0.234.226 Available with Ubuntu Pro linux-image-generic-lpae 5.4.0.234.226 Available with Ubuntu Pro linux-image-generic-lpae-5.4 5.4.0.234.226 Available with Ubuntu Pro linux-image-ibm-5.4 5.4.0.1108.137 Available with Ubuntu Pro linux-image-ibm-lts-20.04 5.4.0.1108.137 Available with Ubuntu Pro linux-image-lowlatency 5.4.0.234.226 Available with Ubuntu Pro linux-image-lowlatency-5.4 5.4.0.234.226 Available with Ubuntu Pro linux-image-oem 5.4.0.234.226 Available with Ubuntu Pro linux-image-oem-osp1 5.4.0.234.226 Available with Ubuntu Pro linux-image-oracle-5.4 5.4.0.1160.154 Available with Ubuntu Pro linux-image-oracle-lts-20.04 5.4.0.1160.154 Available with Ubuntu Pro linux-image-raspi 5.4.0.1145.176 Available with Ubuntu Pro linux-image-raspi-5.4 5.4.0.1145.176 Available with Ubuntu Pro linux-image-raspi2 5.4.0.1145.176 Available with Ubuntu Pro linux-image-virtual 5.4.0.234.226 Available with Ubuntu Pro linux-image-virtual-5.4 5.4.0.234.226 Available with Ubuntu Pro linux-image-xilinx-zynqmp 5.4.0.1080.80 Available with Ubuntu Pro linux-image-xilinx-zynqmp-5.4 5.4.0.1080.80 Available with Ubuntu Pro Ubuntu 18.04 LTS linux-image-5.4.0-1108-ibm 5.4.0-1108.113~18.04.1 Available with Ubuntu Pro linux-image-5.4.0-1145-raspi 5.4.0-1145.158~18.04.1 Available with Ubuntu Pro linux-image-5.4.0-1162-aws 5.4.0-1162.173~18.04.1 Available with Ubuntu Pro linux-image-5.4.0-1165-gcp 5.4.0-1165.174~18.04.1 Available with Ubuntu Pro linux-image-5.4.0-234-generic 5.4.0-234.254~18.04.1 Available with Ubuntu Pro linux-image-5.4.0-234-lowlatency 5.4.0-234.254~18.04.1 Available with Ubuntu Pro linux-image-aws 5.4.0.1162.173~18.04.1 Available with Ubuntu Pro linux-image-aws-5.4 5.4.0.1162.173~18.04.1 Available with Ubuntu Pro linux-image-gcp 5.4.0.1165.174~18.04.1 Available with Ubuntu Pro linux-image-gcp-5.4 5.4.0.1165.174~18.04.1 Available with Ubuntu Pro linux-image-generic-5.4 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-generic-hwe-18.04 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-ibm 5.4.0.1108.113~18.04.1 Available with Ubuntu Pro linux-image-ibm-5.4 5.4.0.1108.113~18.04.1 Available with Ubuntu Pro linux-image-lowlatency-5.4 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-lowlatency-hwe-18.04 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-oem 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-oem-osp1 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-raspi-5.4 5.4.0.1145.158~18.04.1 Available with Ubuntu Pro linux-image-raspi-hwe-18.04 5.4.0.1145.158~18.04.1 Available with Ubuntu Pro linux-image-snapdragon-5.4 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-snapdragon-hwe-18.04 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-virtual-5.4 5.4.0.234.254~18.04.1 Available with Ubuntu Pro linux-image-virtual-hwe-18.04 5.4.0.234.254~18.04.1 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.

CVE-2021-47378, CVE-2025-27558, CVE-2026-23392, CVE-2026-31405,

CVE-2026-31414, CVE-2026-31448, CVE-2026-31657, CVE-2026-31668,

CVE-2026-43071, CVE-2026-43198, CVE-2026-43493, CVE-2026-43499,

CVE-2026-46266, CVE-2026-46331, CVE-2026-52914, CVE-2026-52924,

CVE-2026-52931, CVE-2026-52955, CVE-2026-52958, CVE-2026-52982,

CVE-2026-52986, CVE-2026-52989, CVE-2026-52993, CVE-2026-52999,

CVE-2026-53002, CVE-2026-53006, CVE-2026-53045, CVE-2026-53088,

CVE-2026-53176, CVE-2026-53212, CVE-2026-53228, CVE-2026-53359

Ubuntu Security Notice USN-8666-1

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