Ubuntu USN-8658-1 Linux Kernel Security Update (Open vSwitch/SCTP)

Vulnerability Overview Vulnerability ID: USN-8658-1 Publication Date: August 20, 2026 Description: Multiple security issues were discovered in the Linux kernel that attackers may exploit to compromise the system. Specifically, the vulnerabilities affect Open vSwitch and the SCTP protocol. Scope of Impact Affected Systems: - Linux kernel - Linux kernel for Amazon Web Services (AWS) systems - Linux kernel for Amazon Web Services (AWS) systems with FIPS - Linux kernel for Microsoft Azure Cloud systems with FIPS - Linux kernel for Google Container Engine (GKE) systems - Linux kernel for IBM cloud systems - Linux kernel for Intel IoT Real-time platforms - Linux kernel for Intel IoT platforms - Linux kernel for cloud environments - Linux kernel for NVIDIA systems - Linux kernel for NVIDIA Tegra systems - Linux kernel for Oracle Cloud systems - Linux kernel for Real-time systems - Linux kernel for Xilinx ZynqMP processors Remediation Update Instructions: - After updating standard systems, a computer restart is required to apply all necessary changes. - Due to unavoidable ABI (Application Binary Interface) changes, kernel updates have been assigned new version numbers, requiring the recompilation and reinstallation of all third-party kernel modules. Unless the standard kernel meta-packages (such as , , , ) are manually uninstalled, this process will be automatically executed during a standard system upgrade. Specific Update Versions: - 22.04 LTS (Jammy): - – 5.15.0-1066.68 - – 5.15.0-1066.68 - – 5.15.0-1077.81 - – 5.15.0-1097.105 - – 5.15.0-1106.108 (Real-time) - – 5.15.0-1106.111 - – 5.15.0-1109.115 - – 5.15.0-1109.110 - – 5.15.0-1109.110 - – 5.15.0-1111.117 - – 5.15.0-1113.122 (Real-time) - – 5.15.0-1114.121 - – 5.15.0-1114.121 - – 5.15.0-1114.121+fips1 (FIPS Updates) - – 5.15.0-1119.128+fips1 (FIPS Updates) - – 5.15.0-190.200 - – 5.15.0-190.200 - – 5.15.0-190.200 - – 5.15.0.1114.117 - – 5.15.0.1114.117 - – 5.15.0.1114.117 - – 5.15.0.1114.110 (FIPS Updates) - – 5.15.0.1114.110 (FIPS Updates) - – 5.15.0.1114.117 - – 5.15.0.1119.104 (FIPS Updates) - – 5.15.0.1119.104 (FIPS Updates) - – 5.15.0.190.169 - – 5.15.0.190.169 - – 5.15.0.190.169 - – 5.15.0.190.169 - – 5.15.0.190.169 - – 5.15.0.190.169 - – 5.15.0.1097.96 - – 5.15.0.1097.96 - – 5.15.0.1106.110 (Real-time) - – 5.15.0.1106.110 (Real-time) - – 5.15.0.1109.108 - – 5.15.0.1109.108 - – 5.15.0.1106.102 - – 5.15.0.1106.102 - – 5.15.0.1109.109 - – 5.15.0.1109.109 - – 5.15.0.1109.109 - – 5.15.0.1109.109 - – 5.15.0.1066.66 - – 5.15.0.1066.66 - – 5.15.0.1066.66 - – 5.15.0.1066.66 - – 5.15.0.1111.107 - – 5.15.0.1111.107 - – 5.15.0.1113.117 (Real-time) - – 5.15.0.1113.117 (Real-time) - – 5.15.0.190.169 - – 5.15.0.190.169 - – 5.15.0.1077.80 - – 5.15.0.1077.80 - 20.04 LTS (Focal): - – 5.15.0-1066.68-20.04.1 (Ubuntu Pro) - – 5.15.0-1066.68-20.04.1 (Ubuntu Pro) - – 5.15.0-1108.112-20.04.1 (Ubuntu Pro) - – 5.15.0-1109.115-20.04.1 (Ubuntu Pro) - – 5.15.0.1108.112-20.04.1 (Ubuntu Pro) - – 5.15.0.1108.112-20.04.1 (Ubuntu Pro) - – 5.15.0.1109.115-20.04.1 (Ubuntu Pro) - – 5.15.0.1109.115-20.04.1 (Ubuntu Pro) - – 5.15.0.1109.115-20.04.1 (Ubuntu Pro) - – 5.15.0.1066.68-20.04.1 (Ubuntu Pro) - – 5.15.0.1066.68-20.04.1 (Ubuntu Pro) - – 5.15.0.1066.68-20.04.1 (Ubuntu Pro) - – 5.15.0.1111.117-20.04.1 (Ubuntu Pro) - – 5.15.0.1111.117-20.04.1 (Ubuntu Pro) References CVE-2026-64531 CVE-2026-53246 CVE-2026-53224 Related Notices USN-8656-1 USN-8646-1 USN-8645-1 USN-8644-1 USN-8643-1 USN-8643-2 USN-8637-1 USN-8629-1 USN-8629-2 USN-8629-3 Reduced Exposure Ubuntu Pro provides ten years of security coverage, covering packages in over 25,000 Main and Universe repositories, and can be used for free for up to five machines. Other Issues For questions, please contact team members. Footer Information Contains links to OpenStack, Ceph, Kubernetes, Managed infrastructure, AI / ML, Robotics, IoT, Ubuntu Core, Ubuntu Desktop, Ubuntu Server, Cloud, Security, Landscape, Containers, Downloads, Support, Pricing, Solutions, Sectors, etc. Contact Us Contact us Other Links About Us, Community, Careers, Blog, Resources, News Center, etc. Social Media Twitter, Facebook, LinkedIn, Instagram, YouTube, Reddit, GitHub, etc.

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Ubuntu USN-8658-1 Linux Kernel Security Update (Open vSwitch/SCTP)

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