========================================================================== Ubuntu Security Notice USN-7860-5 November 10, 2025
linux-hwe-6.14 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS Summary: The system could be made to expose sensitive information. Software Description: - linux-hwe-6.14: Linux hardware enablement (HWE) kernel Details: Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS linux-image-6.14.0-35-generic 6.14.0-35.35~24.04.1 linux-image-6.14.0-35-generic-64k 6.14.0-35.35~24.04.1 linux-image-generic-6.14 6.14.0-35.35~24.04.1 linux-image-generic-64k-6.14 6.14.0-35.35~24.04.1 linux-image-generic-64k-hwe-24.04 6.14.0-35.35~24.04.1 linux-image-generic-hwe-24.04 6.14.0-35.35~24.04.1 linux-image-virtual-6.14 6.14.0-35.35~24.04.1 linux-image-virtual-hwe-24.04 6.14.0-35.35~24.04.1 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-7860-5 https://ubuntu.com/security/notices/USN-7860-4 https://ubuntu.com/security/notices/USN-7860-3 https://ubuntu.com/security/notices/USN-7860-2 https://ubuntu.com/security/notices/USN-7860-1 CVE-2025-40300 Package Information: https://launchpad.net/ubuntu/+source/linux-hwe-6.14/6.14.0-35.35~24.04.1
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