Ubuntu Security Notices USN-8273-1 USN-8273-1: Linux kernel vulnerabilities Publication date 19 May 2026 Overview Several security issues were fixed in the Linux kernel. Releases 20.04 LTS 18.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices 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-aws-fips - Linux kernel for Amazon Web Services (AWS) systems with FIPS linux-azure - Linux kernel for Microsoft Azure Cloud systems linux-azure-5.4 - 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-5.4 - Linux kernel for Google Cloud Platform (GCP) systems linux-gcp-fips - Linux kernel for Google Cloud Platform (GCP) systems with FIPS 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-kvm - Linux kernel for cloud environments linux-oracle - Linux kernel for Oracle Cloud systems linux-oracle-5.4 - Linux kernel for Oracle Cloud systems linux-xilinx-zynqmp - Linux kernel for Xilinx ZynqMP processors Details 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: Network drivers; NVME drivers; IPv4 networking 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: Network drivers; NVME drivers; IPv4 networking 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-5.4.0-1062-iot – 5.4.0-1062.65 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1076-xilinx-zynqmp – 5.4.0-1076.80 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1104-ibm – 5.4.0-1104.109 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1117-bluefield – 5.4.0-1117.124 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1132-fips – 5.4.0-1132.142 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-5.4.0-1145-kvm – 5.4.0-1145.154 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1156-oracle – 5.4.0-1156.166 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1158-aws – 5.4.0-1158.168 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1158-aws-fips – 5.4.0-1158.168+fips1 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-5.4.0-1161-gcp – 5.4.0-1161.170 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1161-gcp-fips – 5.4.0-1161.170+fips1 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-5.4.0-1162-azure – 5.4.0-1162.168 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1162-azure-fips – 5.4.0-1162.168+fips1 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-5.4.0-229-generic – 5.4.0-229.249 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-229-generic-lpae – 5.4.0-229.249 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-229-lowlatency – 5.4.0-229.249 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws-5.4 – 5.4.0.1158.155 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws-fips – 5.4.0.1158.105 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-aws-fips-5.4 – 5.4.0.1158.105 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-aws-lts-20.04 – 5.4.0.1158.155 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-azure-5.4 – 5.4.0.1162.154 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-azure-fips – 5.4.0.1162.98 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-azure-fips-5.4 – 5.4.0.1162.98 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-azure-lts-20.04 – 5.4.0.1162.154 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-bluefield – 5.4.0.1117.113 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-bluefield-5.4 – 5.4.0.1117.113 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-fips – 5.4.0.1132.129 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-fips-5.4 – 5.4.0.1132.129 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-gcp-5.4 – 5.4.0.1161.163 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-gcp-fips – 5.4.0.1161.103 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-gcp-fips-5.4 – 5.4.0.1161.103 FIPS Updates FIPS-140 certified package with security fixes. Available with Ubuntu Pro. linux-image-gcp-lts-20.04 – 5.4.0.1161.163 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-5.4 – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-lpae – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-lpae-5.4 – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-ibm-5.4 – 5.4.0.1104.133 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-ibm-lts-20.04 – 5.4.0.1104.133 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-kvm – 5.4.0.1145.141 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-kvm-5.4 – 5.4.0.1145.141 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency-5.4 – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oem – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oem-osp1 – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oracle-5.4 – 5.4.0.1156.150 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oracle-lts-20.04 – 5.4.0.1156.150 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual-5.4 – 5.4.0.229.221 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-xilinx-zynqmp – 5.4.0.1076.76 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-xilinx-zynqmp-5.4 – 5.4.0.1076.76 Ubuntu Pro Fix available with Ubuntu Pro . 18.04 LTS bionic linux-image-5.4.0-1104-ibm – 5.4.0-1104.109~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1156-oracle – 5.4.0-1156.166~18.04.2+1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1158-aws – 5.4.0-1158.168~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1161-gcp – 5.4.0-1161.170~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-1162-azure – 5.4.0-1162.168~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-229-generic – 5.4.0-229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-5.4.0-229-lowlatency – 5.4.0-229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws – 5.4.0.1158.168~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws-5.4 – 5.4.0.1158.168~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-azure – 5.4.0.1162.168~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-azure-5.4 – 5.4.0.1162.168~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-gcp – 5.4.0.1161.170~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-gcp-5.4 – 5.4.0.1161.170~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-5.4 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-hwe-18.04 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-ibm – 5.4.0.1104.109~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-ibm-5.4 – 5.4.0.1104.109~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency-5.4 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency-hwe-18.04 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oem – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oem-osp1 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oracle – 5.4.0.1156.166~18.04.3 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oracle-5.4 – 5.4.0.1156.166~18.04.3 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-snapdragon-5.4 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-snapdragon-hwe-18.04 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual-5.4 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual-hwe-18.04 – 5.4.0.229.249~18.04.1 Ubuntu Pro Fix available with Ubuntu Pro . 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