==========================================================================
Ubuntu Security Notice USN-7907-3
December 04, 2025

linux-gcp, linux-gcp-4.15, linux-hwe vulnerabilities
==========================================================================

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-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) 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:
  - Cryptographic API;
  - ACPI drivers;
  - Hardware monitoring drivers;
  - InfiniBand drivers;
  - Mailbox framework;
  - Network drivers;
  - AFS file system;
  - Ceph distributed file system;
  - Network file system (NFS) server daemon;
  - NILFS2 file system;
  - File systems infrastructure;
  - KVM subsystem;
  - L3 Master device support module;
  - Tracing infrastructure;
  - Memory management;
  - Appletalk network protocol;
  - Netfilter;
  - Open vSwitch;
(CVE-2021-47385, CVE-2022-49026, CVE-2022-49390, CVE-2024-49935,
CVE-2024-49963, CVE-2024-50067, CVE-2024-50095, CVE-2024-50179,
CVE-2024-53090, CVE-2024-53112, CVE-2024-53217, CVE-2024-58083,
CVE-2025-21715, CVE-2025-21722, CVE-2025-21761, CVE-2025-21791,
CVE-2025-21811, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666,
CVE-2025-39964, CVE-2025-40018)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
  linux-image-4.15.0-1180-gcp     4.15.0-1180.197
                                  Available with Ubuntu Pro
  linux-image-gcp-4.15            4.15.0.1180.193
                                  Available with Ubuntu Pro
  linux-image-gcp-lts-18.04       4.15.0.1180.193
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  linux-image-4.15.0-1180-gcp     4.15.0-1180.197~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-245-generic  4.15.0-245.257~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-245-lowlatency  4.15.0-245.257~16.04.1
                                  Available with Ubuntu Pro
  linux-image-gcp                 4.15.0.1180.197~16.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-hwe-16.04   4.15.0.245.257~16.04.1
                                  Available with Ubuntu Pro
  linux-image-gke                 4.15.0.1180.197~16.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-hwe-16.04  4.15.0.245.257~16.04.1
                                  Available with Ubuntu Pro
  linux-image-oem                 4.15.0.245.257~16.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-hwe-16.04   4.15.0.245.257~16.04.1
                                  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-7907-3
  https://ubuntu.com/security/notices/USN-7907-2
  https://ubuntu.com/security/notices/USN-7907-1
  CVE-2021-47385, CVE-2022-49026, CVE-2022-49390, CVE-2024-49935,
  CVE-2024-49963, CVE-2024-50067, CVE-2024-50095, CVE-2024-50179,
  CVE-2024-53090, CVE-2024-53112, CVE-2024-53217, CVE-2024-58083,
  CVE-2025-21715, CVE-2025-21722, CVE-2025-21761, CVE-2025-21791,
  CVE-2025-21811, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666,
  CVE-2025-39964, CVE-2025-40018