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Ubuntu 16.04 LTS: Linux Kernel Critical VMSCAPE Info Leak 2025:7863-1

ubuntu
Calendar Grey November 6, 2025
Dist Ubuntu Esm H88
Updates for Ubuntu fix multiple Linux kernel issues including potential information leakage and DDoS vulnerabilities.
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-kvm: Linux kernel for cloud environments - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty 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: ...

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Topics%20covered

Topics Covered

security advisory denial of service information leak critical Ubuntu Linux kernel

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS linux-image-4.4.0-1150-kvm 4.4.0-1150.161 Available with Ubuntu Pro linux-image-4.4.0-1187-aws 4.4.0-1187.202 Available with Ubuntu Pro linux-image-4.4.0-274-generic 4.4.0-274.308 Available with Ubuntu Pro linux-image-4.4.0-274-lowlatency 4.4.0-274.308 Available with Ubuntu Pro linux-image-aws 4.4.0.1187.191 Available with Ubuntu Pro linux-image-generic 4.4.0.274.280 Available with Ubuntu Pro linux-image-generic-lts-xenial 4.4.0.274.280 Available with Ubuntu Pro linux-image-kvm 4.4.0.1150.147 Available with Ubuntu Pro linux-image-lowlatency 4.4.0.274.280 Available with Ubuntu Pro linux-image-lowlatency-lts-xenial 4.4.0.274.280 Available with Ubuntu Pro linux-image-virtual 4.4.0.274.280 Available with Ubuntu Pro linux-image-virtual-lts-xenial 4.4.0.274.280 Available with Ubuntu Pro Ubuntu 14.04 LTS linux-image-4.4.0-1149-aws 4.4.0-1149.155 Available with Ubuntu Pro linux-image-4.4.0-274-generic 4.4.0-274.308~14.04.1 Available with Ubuntu Pro linux-image-4.4.0-274-lowlatency 4.4.0-274.308~14.04.1 Available with Ubuntu Pro linux-image-aws 4.4.0.1149.146 Available with Ubuntu Pro linux-image-generic-lts-xenial 4.4.0.274.308~14.04.1 Available with Ubuntu Pro linux-image-lowlatency-lts-xenial 4.4.0.274.308~14.04.1 Available with Ubuntu Pro linux-image-virtual-lts-xenial 4.4.0.274.308~14.04.1 Available with Ubuntu Pro 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-7863-1

CVE-2021-47294, CVE-2021-47330, CVE-2023-52574, CVE-2023-52650,

CVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150,

CVE-2024-56767, CVE-2025-37838, CVE-2025-38352, CVE-2025-40300

Severity
critical
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Critical

Ubuntu Security Notice USN-7863-1

Topics%20covered

Topics Covered

security advisory denial of service information leak critical Ubuntu Linux kernel

Package Information

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