========================================================================== Ubuntu Security Notice USN-7935-1 December 15, 2025
linux-azure, linux-azure-6.8 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-azure-6.8: Linux kernel for Microsoft Azure cloud systems 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. (CVE-2025-40300) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - HSI subsystem; - Media drivers; - Network drivers; - Bluetooth subsystem; - Timer subsystem; - Memory management; - Appletalk network protocol; - Netfilter; - TLS protocol; (CVE-2025-21729, CVE-2025-37838, CVE-2025-37958, CVE-2025-38118, CVE-2025-38227, CVE-2025-38352, CVE-2025-38616, CVE-2025-38666, CVE-2025-38678, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS linux-image-6.8.0-1044-azure 6.8.0-1044.50 linux-image-azure-6.8 6.8.0-1044.50 linux-image-azure-lts-24.04 6.8.0-1044.50 Ubuntu 22.04 LTS linux-image-6.8.0-1044-azure 6.8.0-1044.50~22.04.1 linux-image-azure 6.8.0-1044.50~22.04.1 linux-image-azure-6.8 6.8.0-1044.50~22.04.1 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-7935-1 CVE-2025-21729, CVE-2025-37838, CVE-2025-37958, CVE-2025-38118, CVE-2025-38227, CVE-2025-38352, CVE-2025-38616, CVE-2025-38666, CVE-2025-38678, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018, CVE-2025-40300 Package Information: https://launchpad.net/ubuntu/+source/linux-azure/6.8.0-1044.50 https://launchpad.net/ubuntu/+source/linux-azure-6.8/6.8.0-1044.50~22.04.1
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