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Ubuntu 18.04 LTS Kernel Critical Vulnerabilities Fix USN-8145-2

ubuntu
Calendar Grey April 2, 2026
Dist Ubuntu Esm H88
Critical updates for Ubuntu 18.04 LTS addressing multiple Linux kernel issues ensuring system integrity.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS

- linux-fips: Linux kernel with FIPS

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:

- ARM64 architecture;

- Cryptographic API;

- UDF file system;

- NFC subsystem;

- Network traffic control;

(CVE-2024-46777, CVE-2025-21735, CVE-2025-37849, CVE-2026-23060,

CVE-2026-23074)

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel system compromise network-traffic-control

Update Instructions

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

Ubuntu 18.04 LTS
   linux-image-4.15.0-1145-fips    4.15.0-1145.157
                                   Available with Ubuntu Pro
   linux-image-4.15.0-2128-aws-fips  4.15.0-2128.134
                                   Available with Ubuntu Pro
   linux-image-aws-fips            4.15.0.2128.122
                                   Available with Ubuntu Pro
   linux-image-aws-fips-4.15       4.15.0.2128.122
                                   Available with Ubuntu Pro
   linux-image-fips                4.15.0.1145.142
                                   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-8145-2

https://ubuntu.com/security/notices/USN-8145-1

CVE-2024-46777, CVE-2025-21735, CVE-2025-37849, CVE-2026-23060,

CVE-2026-23074

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8145-2

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel system compromise network-traffic-control

Package Information

https://launchpad.net/ubuntu/+source/linux-aws-fips/4.15.0-2128.134
https://launchpad.net/ubuntu/+source/linux-fips/4.15.0-1145.157

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