========================================================================== Ubuntu Security Notice USN-7861-4 November 19, 2025
linux-aws-6.8 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-aws-6.8: Linux kernel for Amazon Web Services (AWS) 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: - HSI subsystem; - Bluetooth subsystem; - Timer subsystem; (CVE-2025-37838, CVE-2025-38118, CVE-2025-38352) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS linux-image-6.8.0-1042-aws 6.8.0-1042.44~22.04.1 linux-image-6.8.0-1042-aws-64k 6.8.0-1042.44~22.04.1 linux-image-aws 6.8.0-1042.44~22.04.1 linux-image-aws-6.8 6.8.0-1042.44~22.04.1 linux-image-aws-64k 6.8.0-1042.44~22.04.1 linux-image-aws-64k-6.8 6.8.0-1042.44~22.04.1 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-7861-4 https://ubuntu.com/security/notices/USN-7861-3 https://ubuntu.com/security/notices/USN-7861-2 https://ubuntu.com/security/notices/USN-7861-1 CVE-2025-37838, CVE-2025-38118, CVE-2025-38352, CVE-2025-40300 Package Information: https://launchpad.net/ubuntu/+source/linux-aws-6.8/6.8.0-1042.44~22.04.1
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