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Ubuntu 18.04: USN-7853-2 Linux-FIPS Critical Update CVE-2025-40300

ubuntu
Calendar Grey October 30, 2025
Dist Ubuntu Esm H88
Security vulnerabilities in Ubuntu's Linux kernel fixed with updates. Critical steps for protecting systems are outlined.
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS - linux-fips: Linux kernel with FIPS - linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS 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: - DMA engine subsystem; - GP...

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Topics%20covered

Topics Covered

security advisory Ubuntu system compromise AWS linux-fips insufficient isolation

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.15.0-1141-fips 4.15.0-1141.153 Available with Ubuntu Pro linux-image-4.15.0-2087-gcp-fips 4.15.0-2087.93 Available with Ubuntu Pro linux-image-4.15.0-2124-aws-fips 4.15.0-2124.130 Available with Ubuntu Pro linux-image-aws-fips 4.15.0.2124.118 Available with Ubuntu Pro linux-image-aws-fips-4.15 4.15.0.2124.118 Available with Ubuntu Pro linux-image-fips 4.15.0.1141.138 Available with Ubuntu Pro linux-image-gcp-fips 4.15.0.2087.85 Available with Ubuntu Pro linux-image-gcp-fips-4.15 4.15.0.2087.85 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-7853-2

https://ubuntu.com/security/notices/USN-7853-1

CVE-2023-52574, CVE-2023-52650, CVE-2024-41006, 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-7853-2

Topics%20covered

Topics Covered

security advisory Ubuntu system compromise AWS linux-fips insufficient isolation

Package Information

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