[USN-8145-2] Linux kernel (FIPS) vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-8145-2
April 02, 2026

linux-fips, linux-aws-fips vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

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)

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

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