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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

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;

- Network file system (NFS) server daemon;

- Packet sockets;

- Network traffic control;

- VMware vSockets driver;

(CVE-2...

Read the Full Advisory

Topics%20covered

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
Lowest
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Medium
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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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