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Ubuntu 16.04 LTS Linux Kernel Critical System Compromise USN-8143-1

ubuntu
Calendar Grey April 1, 2026
Dist Ubuntu Esm H88
Critical security issues fixed in the Linux kernel for Ubuntu releases require immediate updates and system reboots.
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-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)

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 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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8143-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel linux system compromise

Package Information

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