ESB-2026.5389

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.5389 USN-8273-1: Linux kernel vulnerabilities 20 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Linux kernel Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-23209 CVE-2024-50304 CVE-2026-23112 Original Bulletin: https://ubuntu.com/security/notices/USN-8273-1 Comment: CVSS (Max): 9.8 CVE-2026-23112 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H EPSS (Max): 0.1% (23rd) CVE-2026-23112 2026-05-18 - --------------------------BEGIN INCLUDED TEXT-------------------- 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 Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems o linux-aws-fips - Linux kernel for Amazon Web Services (AWS) systems with FIPS o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems o linux-azure-fips - Linux kernel for Microsoft Azure Cloud systems with FIPS o linux-bluefield - Linux kernel for NVIDIA BlueField platforms o linux-fips - Linux kernel with FIPS o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-fips - Linux kernel for Google Cloud Platform (GCP) systems with FIPS o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel o linux-ibm - Linux kernel for IBM cloud systems o linux-ibm-5.4 - Linux kernel for IBM cloud systems o linux-iot - Linux kernel for IoT platforms o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-oracle-5.4 - Linux kernel for Oracle Cloud systems o 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: o Network drivers; o NVME drivers; o IPv4 networking Update instructions 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 Package Version Release 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 20.04 LTS with Ubuntu Pro . focal 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 . 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 . 18.04 LTS linux-image-generic-5.4 - 5.4.0.229.249~18.04.1 Ubuntu Pro Fix bionic 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 . --------------------------------------------------------------------------------- References o CVE-2026-23209 o CVE-2026-23112 o CVE-2024-50304 Related notices o USN-8267-1 o USN-8266-1 o USN-8265-1 o USN-8261-1 o USN-8260-1 o USN-8258-1 o USN-8257-1 o USN-8255-1 o USN-8255-2 o USN-8254-1 o USN-8254-2 o USN-8245-1 o USN-8244-1 o USN-8243-1 o USN-8204-1 o USN-8203-1 o USN-8188-1 o USN-8187-1 o USN-8186-1 o USN-8185-1 o USN-8185-2 o USN-8184-1 o USN-8183-1 o USN-8183-2 o USN-8180-1 o USN-8180-2 o USN-8180-3 o USN-8180-4 o USN-8180-5 o USN-8180-6 o USN-8179-1 o USN-8179-2 o USN-8179-3 o USN-8179-4 o USN-8177-1 o USN-8177-2 o USN-8162-1 o USN-7524-1 o USN-7523-1 o USN-7468-1 o USN-7459-1 o USN-7459-2 o USN-7458-1 o USN-7453-1 o USN-7452-1 o USN-7451-1 o USN-7450-1 o USN-7449-1 o USN-7449-2 o USN-7421-1 o USN-7407-1 o USN-7390-1 o USN-7389-1 o USN-7388-1 o USN-7387-1 o USN-7387-2 o USN-7387-3 o USN-7310-1 o USN-7277-1 o USN-7276-1 --------------------------------------------------------------------------------- - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================