Ubuntu Security Notice: Linux Kernel Fixes for Open vSwitch and SCTP

Vulnerability Overview Vulnerability ID: USN-8658-3 Release Date: 25 August 2026 Affected Systems: Linux kernel Vulnerability Description: Multiple security issues were discovered in the Linux kernel, which an attacker could exploit to compromise the system. Specific subsystems involved are: - Open vSwitch - SCTP protocol Impact Scope Affected Packages: - : Linux kernel for Microsoft Azure Cloud systems - : Linux kernel for Microsoft Azure CVM cloud systems - : Linux kernel for NVIDIA Tegra IGX systems Remediation Update Instructions: - After a standard system update, a computer restart is required to apply all necessary changes. - Due to unavoidable ABI changes, kernel updates are assigned new version numbers, requiring all third-party kernel modules to be recompiled and reinstalled. Unless standard kernel meta-packages (such as , , , ) are manually uninstalled, a standard system upgrade will perform this automatically. Specific Update Versions: - Ubuntu 22.04 LTS (Jammy): - – 5.15.0-1055.55 - – 5.15.0-1055.55 - – 5.15.0-1119.128 - – 5.15.0-1119.128 - – 5.15.0-1119.117 - – 5.15.0-1119.128 - – 5.15.0-1119.128 - – 5.15.0-1119.117 - – 5.15.0-1055.57 - – 5.15.0-1055.57 - – 5.15.0-1055.57 - – 5.15.0-1055.57 References CVE-2026-64531 CVE-2026-53246 CVE-2026-53224 Related Notices USN-8664-1 USN-8663-1 USN-8661-1 USN-8661-2 USN-8660-1 USN-8659-2 USN-8659-1 USN-8658-1 USN-8658-2 USN-8656-1 Additional Information Reducing Security Risk: Ubuntu Pro provides ten years of security coverage for over 25,000 packages in the Main and Universe repositories, free for up to five machines. Code Block No POC code or exploit code is included in the page.

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Ubuntu Security Notice: Linux Kernel Fixes for Open vSwitch and SCTP

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