Ubuntu USN-8576-1 Patch: NVIDIA Tegra Kernel NTFS OOB Read & AMD Speculative Execution Side-Channel Fixes

Vulnerability Overview Vulnerability ID: USN-8576-1 Publication Date: 21 July 2026 Affected Systems: Linux kernel (NVIDIA Tegra) Vulnerability Description: - NTFS File System Vulnerability: The NTFS file system implementation fails to correctly validate file name length, leading to out-of-bounds reads in certain scenarios. An attacker can craft a malicious NTFS image; once mounted, this may lead to the leakage of sensitive information (kernel memory). (CVE-2023-45896) - AMD Processor Vulnerability: Certain AMD processors fail to properly clear data in the floating-point division unit during speculative execution. Attackers can exploit this vulnerability to leak sensitive information. (CVE-2025-54505) - AMD Zen 2 Processor Vulnerability: Certain AMD Zen 2 processors fail to properly isolate shared resources in the operations cache. Attackers can exploit this vulnerability to escalate privileges. (CVE-2025-54506) Scope of Impact Affected Versions: 20.04 LTS Affected Package: linux-nvidia-tegra-5.15 - Linux kernel for NVIDIA Tegra systems Remediation Plan Update Instructions: - After updating the standard system, restart the computer to apply all changes. - Due to 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., linux-generic, linux-generic-lts-release, linux-virtual, linux-powerpc) are manually uninstalled, this action will be performed automatically during a standard system upgrade. Updated Package Versions: - Ubuntu Release: 20.04 LTS (Focal) - Package Versions: - linux-image-5.15.0-1064-nvidia-tegra - 5.15.0-1064.66~20.04.1 - linux-image-5.15.0-1064-nvidia-tegra-rt - 5.15.0-1064.66~20.04.1 - linux-image-nvidia-tegra - 5.15.0-1064.66~20.04.1 - linux-image-nvidia-tegra-5.15 - 5.15.0-1064.66~20.04.1 - linux-image-nvidia-tegra-rt - 5.15.0-1064.66~20.04.1 References CVE IDs: - CVE-2026-64185 - CVE-2026-64179 - CVE-2026-64178 - CVE-2026-64177 - CVE-2026-64174 - CVE-2026-64173 - CVE-2026-64168 - CVE-2026-64166 - CVE-2026-64165 - CVE-2026-64164 Related Notices USN IDs: - USN-8575-1 - USN-8574-1 - USN-8570-1 - USN-8569-1 - USN-8568-1 - USN-8567-1 - USN-8566-1 - USN-8546-1 - USN-8545-1 - USN-8508-1 Reducing Security Risks Ubuntu Pro: Provides ten years of security coverage for packages in the main and universe repositories (25,000+ packages), free for use on up to five machines. Additional Information Contact Team: For further questions, please contact the team members.

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Ubuntu USN-8576-1 Patch: NVIDIA Tegra Kernel NTFS OOB Read & AMD Speculative Execution Side-Channel Fixes

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