[USN-8143-1] Linux kernel vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-8143-1
April 01, 2026

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:
- Cryptographic API;
- GPU drivers;
- BTRFS file system;
- GFS2 file system;
- UDF file system;
- NFC subsystem;
- Network traffic control;
(CVE-2021-47142, CVE-2021-47145, CVE-2021-47254, CVE-2024-46777,
CVE-2025-21735, CVE-2026-23060, CVE-2026-23074)

Update instructions:

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1154-kvm 4.4.0-1154.165
Available with Ubuntu Pro
linux-image-4.4.0-1191-aws 4.4.0-1191.206
Available with Ubuntu Pro
linux-image-4.4.0-279-generic 4.4.0-279.313
Available with Ubuntu Pro
linux-image-4.4.0-279-lowlatency 4.4.0-279.313
Available with Ubuntu Pro
linux-image-aws 4.4.0.1191.195
Available with Ubuntu Pro
linux-image-generic 4.4.0.279.285
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.279.285
Available with Ubuntu Pro
linux-image-kvm 4.4.0.1154.151
Available with Ubuntu Pro
linux-image-lowlatency 4.4.0.279.285
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.279.285
Available with Ubuntu Pro
linux-image-virtual 4.4.0.279.285
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.279.285
Available with Ubuntu Pro

Ubuntu 14.04 LTS
linux-image-4.4.0-1153-aws 4.4.0-1153.159
Available with Ubuntu Pro
linux-image-4.4.0-279-generic 4.4.0-279.313~14.04.1+1
Available with Ubuntu Pro
linux-image-4.4.0-279-lowlatency 4.4.0-279.313~14.04.1+1
Available with Ubuntu Pro
linux-image-aws 4.4.0.1153.150
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.279.313~14.04.1
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.279.313~14.04.1
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.279.313~14.04.1
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-8143-1
CVE-2021-47142, CVE-2021-47145, CVE-2021-47254, CVE-2024-46777,
CVE-2025-21735, CVE-2026-23060, CVE-2026-23074