[USN-7429-1] Linux kernel vulnerabilities

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==========================================================================
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