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Ubuntu 18.04 LTS: USN-7796-1 Critical Linux Kernel Security Issues

ubuntu
Calendar Grey October 2, 2025
Dist Ubuntu Esm H88
Multiple security issues in the Linux kernel of Ubuntu can lead to system compromise if not addressed.
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 - Ubuntu 16.04 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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-oracle: Linux kernel for Oracle Cloud systems - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel Details: 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: - Framebuffer layer; - BTRFS file system; - Ext4 file system; - Net...

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Topics Covered

security advisory critical Ubuntu kernel linux system compromise

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.15.0-1147-oracle 4.15.0-1147.158 Available with Ubuntu Pro linux-image-4.15.0-1178-gcp 4.15.0-1178.195 Available with Ubuntu Pro linux-image-4.15.0-1185-aws 4.15.0-1185.198 Available with Ubuntu Pro linux-image-4.15.0-1193-azure 4.15.0-1193.208 Available with Ubuntu Pro linux-image-4.15.0-242-generic 4.15.0-242.254 Available with Ubuntu Pro linux-image-4.15.0-242-lowlatency 4.15.0-242.254 Available with Ubuntu Pro linux-image-aws-4.15 4.15.0.1185.183 Available with Ubuntu Pro linux-image-aws-lts-18.04 4.15.0.1185.183 Available with Ubuntu Pro linux-image-azure-4.15 4.15.0.1193.161 Available with Ubuntu Pro linux-image-azure-lts-18.04 4.15.0.1193.161 Available with Ubuntu Pro linux-image-gcp-4.15 4.15.0.1178.191 Available with Ubuntu Pro linux-image-gcp-lts-18.04 4.15.0.1178.191 Available with Ubuntu Pro linux-image-generic 4.15.0.242.226 Available with Ubuntu Pro linux-image-lowlatency 4.15.0.242.226 Available with Ubuntu Pro linux-image-oracle-4.15 4.15.0.1147.152 Available with Ubuntu Pro linux-image-oracle-lts-18.04 4.15.0.1147.152 Available with Ubuntu Pro linux-image-virtual 4.15.0.242.226 Available with Ubuntu Pro Ubuntu 16.04 LTS linux-image-4.15.0-1178-gcp 4.15.0-1178.195~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1185-aws 4.15.0-1185.198~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1193-azure 4.15.0-1193.208~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-242-generic 4.15.0-242.254~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-242-lowlatency 4.15.0-242.254~16.04.1 Available with Ubuntu Pro linux-image-aws-hwe 4.15.0.1185.198~16.04.1 Available with Ubuntu Pro linux-image-azure 4.15.0.1193.208~16.04.1 Available with Ubuntu Pro linux-image-gcp 4.15.0.1178.195~16.04.1 Available with Ubuntu Pro linux-image-generic-hwe-16.04 4.15.0.242.254~16.04.1 Available with Ubuntu Pro linux-image-gke 4.15.0.1178.195~16.04.1 Available with Ubuntu Pro linux-image-lowlatency-hwe-16.04 4.15.0.242.254~16.04.1 Available with Ubuntu Pro linux-image-oem 4.15.0.242.254~16.04.1 Available with Ubuntu Pro linux-image-virtual-hwe-16.04 4.15.0.242.254~16.04.1 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-7796-1

CVE-2024-35849, CVE-2024-49924, CVE-2025-21796, CVE-2025-37785,

CVE-2025-38477, CVE-2025-38617, CVE-2025-38618

Severity
critical
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Critical

Ubuntu Security Notice USN-7796-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel linux system compromise

Package Information

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