Ubuntu USN-8545-1: Linux Kernel HWE Multi-Vulnerability Security Bulletin

Vulnerability Overview Vulnerability ID: USN-8545-1 Publication Date: July 15, 2026 Description: Multiple security issues were found in the Linux kernel (HWE). An attacker may leverage these vulnerabilities to compromise the system. Affected Scope Affected Subsystems: - ARM64 architecture - Block layer subsystem - Crypto API - DMA engine subsystem - InfiniBand drivers - STMicroelectronics network drivers - Network drivers - NVMe drivers - SCSI subsystem - USB over IP drivers - Filesystem infrastructure - Ext4 filesystem - Network File System (NFS) server daemon - SMB network filesystem - Kernel thread helpers (kthread) - IPv6 networking - Tracing infrastructure - Kernel system call - Scatterlist API - B.A.T.M.A.N. meshing protocol - Ethernet bridge - Ceph Core library - IPv4 networking - Multipath TCP - Netfilter - RxRPC sessions Remediation Update Instructions: - A restart is required after a standard system update to apply all necessary changes. - Due to inevitable ABI changes, the kernel update is assigned a new version number, requiring all third-party kernel modules to be recompiled and reinstalled. - Unless the standard kernel meta-package (such as , , , ) is manually removed, a standard system upgrade will perform this automatically. Updated Package Versions: - Ubuntu 24.04 LTS (noble): - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 - – 6.17.0-40.40~24.04.1 Reduce Security Risk: - Ubuntu Pro provides ten years of security coverage covering more than 25,000 packages in the main and universe repositories, free for use on up to five machines. References CVE IDs: - CVE-2026-46325 - CVE-2026-46316 - CVE-2026-46289 - CVE-2026-46266 - CVE-2026-46244 - CVE-2026-46243 - CVE-2026-46195 - CVE-2026-46185 - CVE-2026-46135 - CVE-2026-46119 Related Notices USN IDs: - USN-8530-1 - USN-8529-1 - USN-8528-1 - USN-8527-1 - USN-8508-1 - USN-8507-1 - USN-8501-1 - USN-8499-1 - USN-8498-1 - USN-8497-1 Additional Information Contact: For further questions, please contact team members. Footer Information Copyright: © 2026 Canonical Ltd. Trademarks: Ubuntu and Canonical are trademarks of Canonical Ltd. Legal Information: Legal information, data privacy, manage your tracking settings, report bugs on this site.

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Ubuntu USN-8545-1: Linux Kernel HWE Multi-Vulnerability Security Bulletin