[USN-7990-5] Linux kernel (Azure) vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7990-5
February 20, 2026

linux-azure, linux-azure-5.4, linux-azure-fips vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems

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;
- Padata parallel execution mechanism;
- Netfilter;
(CVE-2022-49698, CVE-2025-21726, CVE-2025-40019)

Update instructions:

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

Ubuntu 20.04 LTS
linux-image-5.4.0-1157-azure 5.4.0-1157.164
Available with Ubuntu Pro
linux-image-5.4.0-1158-azure-fips 5.4.0-1158.165+fips1
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1157.151
Available with Ubuntu Pro
linux-image-azure-fips 5.4.0.1158.95
Available with Ubuntu Pro
linux-image-azure-fips-5.4 5.4.0.1158.95
Available with Ubuntu Pro
linux-image-azure-lts-20.04 5.4.0.1157.151
Available with Ubuntu Pro

Ubuntu 18.04 LTS
linux-image-5.4.0-1157-azure 5.4.0-1157.164~18.04.1
Available with Ubuntu Pro
linux-image-azure 5.4.0.1157.164~18.04.1
Available with Ubuntu Pro
linux-image-azure-5.4 5.4.0.1157.164~18.04.1
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-7990-5
https://ubuntu.com/security/notices/USN-7990-4
https://ubuntu.com/security/notices/USN-7990-3
https://ubuntu.com/security/notices/USN-7990-2
https://ubuntu.com/security/notices/USN-7990-1
CVE-2022-49698, CVE-2025-21726, CVE-2025-40019