==========================================================================
Ubuntu Security Notice USN-7429-1
April 09, 2025

linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
==========================================================================

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:

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:
  - Drivers core;
  - HID subsystem;
  - Network drivers;
  - SCSI subsystem;
  - SuperH / SH-Mobile drivers;
  - File systems infrastructure;
  - Ext4 file system;
  - JFS file system;
  - Network file system (NFS) client;
  - Memory management;
  - Network namespace;
  - CAIF protocol;
  - Networking core;
  - HSR network protocol;
  - IPv4 networking;
  - IPv6 networking;
  - MAC80211 subsystem;
  - Network traffic control;
(CVE-2025-21702, CVE-2024-53227, CVE-2024-46826, CVE-2024-49952,
CVE-2024-56600, CVE-2021-47235, CVE-2024-50265, CVE-2021-47119,
CVE-2024-53165, CVE-2021-47483, CVE-2024-50302, CVE-2024-56595,
CVE-2024-50167, CVE-2024-56658, CVE-2024-49948, CVE-2024-26921,
CVE-2021-47602, CVE-2024-26863, CVE-2021-47320, CVE-2025-21700,
CVE-2021-47122)

Update instructions:

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

Ubuntu 16.04 LTS
  linux-image-4.4.0-1143-kvm      4.4.0-1143.154
                                  Available with Ubuntu Pro
  linux-image-4.4.0-1180-aws      4.4.0-1180.195
                                  Available with Ubuntu Pro
  linux-image-4.4.0-267-generic   4.4.0-267.301
                                  Available with Ubuntu Pro
  linux-image-4.4.0-267-lowlatency  4.4.0-267.301
                                  Available with Ubuntu Pro
  linux-image-aws                 4.4.0.1180.184
                                  Available with Ubuntu Pro
  linux-image-generic             4.4.0.267.273
                                  Available with Ubuntu Pro
  linux-image-generic-lts-xenial  4.4.0.267.273
                                  Available with Ubuntu Pro
  linux-image-kvm                 4.4.0.1143.140
                                  Available with Ubuntu Pro
  linux-image-lowlatency          4.4.0.267.273
                                  Available with Ubuntu Pro
  linux-image-lowlatency-lts-xenial  4.4.0.267.273
                                  Available with Ubuntu Pro
  linux-image-virtual             4.4.0.267.273
                                  Available with Ubuntu Pro
  linux-image-virtual-lts-xenial  4.4.0.267.273
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  linux-image-4.4.0-1142-aws      4.4.0-1142.148
                                  Available with Ubuntu Pro
  linux-image-4.4.0-267-generic   4.4.0-267.301~14.04.1
                                  Available with Ubuntu Pro
  linux-image-4.4.0-267-lowlatency  4.4.0-267.301~14.04.1
                                  Available with Ubuntu Pro
  linux-image-aws                 4.4.0.1142.139
                                  Available with Ubuntu Pro
  linux-image-generic-lts-xenial  4.4.0.267.301~14.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-lts-xenial  4.4.0.267.301~14.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-lts-xenial  4.4.0.267.301~14.04.1
                                  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-7429-1
  CVE-2021-47119, CVE-2021-47122, CVE-2021-47235, CVE-2021-47320,
  CVE-2021-47483, CVE-2021-47602, CVE-2024-26863, CVE-2024-26921,
  CVE-2024-46826, CVE-2024-49948, CVE-2024-49952, CVE-2024-50167,
  CVE-2024-50265, CVE-2024-50302, CVE-2024-53165, CVE-2024-53227,
  CVE-2024-56595, CVE-2024-56600, CVE-2024-56658, CVE-2025-21700,
  CVE-2025-21702