Ubuntu USN-8636-2 Linux Kernel Multiple Vulnerability Fix Advisory

Vulnerability Overview Vulnerability ID: USN-8636-2 Release Date: August 18, 2026 Description: Multiple security issues were discovered in the Linux kernel that could allow attackers to compromise the system. This update fixes defects in the following subsystems: - x86 architecture - InfiniBand drivers - Media drivers - Network drivers - Mellanox network drivers - Texas Instruments network drivers - NVMe drivers - Filesystem infrastructure - SMB network filesystem - IPv4 networking - Traffic control networking - TCP network protocol - Locking primitives - Memory management - IPv6 networking - Multipath TCP - Netfilter - RPC session sockets - SCTP protocol - SMC sockets Impact Scope Affected Systems: Linux kernel Affected Versions: 24.04 LTS Remediation Update Instructions: - A system reboot is required after a standard system update to apply all necessary changes. - Due to unavoidable ABI changes, the kernel update has been assigned a new version number, requiring all third-party kernel modules to be recompiled and reinstalled. Unless the standard kernel meta-packages (e.g., , , , ) are manually removed, standard system upgrades will perform this automatically. Specific Package Versions: - Ubuntu Release: 24.04 LTS (noble) - Package Versions: - – 6.17.0-1020.20 - – 6.17.0-1020.20 - – 6.17.0-1020.20 - – 6.17.0-1020.20 - – 6.17.0-1020.20 - – 6.17.0-1020.20 References CVE-2026-53359 CVE-2026-53228 CVE-2026-53225 CVE-2026-53212 CVE-2026-53176 CVE-2026-53131 CVE-2026-53086 CVE-2026-52999 CVE-2026-52924 CVE-2026-46331 Related Notices USN-8645-1 USN-8637-1 USN-8636-1 USN-8635-1 USN-8634-1 USN-8633-2 USN-8633-1 USN-8631-2 USN-8631-3 Additional Information Risk Mitigation: Ubuntu Pro provides ten years of security coverage for over 25,000 packages in the Main and Universe repositories, free for use on up to five machines. Contact Information For further questions, please contact the team members. Footer Information Includes links to products such as OpenStack, Ceph, Kubernetes, as well as relevant information for Ubuntu Core, Ubuntu Desktop, and Ubuntu Server. Provides trademark registration information for Ubuntu and Canonical.

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Ubuntu USN-8636-2 Linux Kernel Multiple Vulnerability Fix Advisory