Ubuntu alert USN-8281-2 (linux-azure-4.15, linux-azure-fips)

From:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8281-2] Linux kernel (Azure) vulnerabilities
Date:
             
 
Fri, 22 May 2026 18:28:20 -0300
Message-ID:
             
 
<27d2b0f4-271e-41f0-b2a1-cd0e2f282152@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8281-2
May 22, 2026

linux-azure-4.15, linux-azure-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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS

Details:

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

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;
   - Packet sockets;
(CVE-2026-31504, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)

Update instructions:

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

Ubuntu 18.04 LTS
   linux-image-4.15.0-1201-azure   4.15.0-1201.216
                                   Available with Ubuntu Pro
   linux-image-4.15.0-2110-azure-fips  4.15.0-2110.116
                                   Available with Ubuntu Pro
   linux-image-azure-4.15          4.15.0.1201.169
                                   Available with Ubuntu Pro
   linux-image-azure-fips          4.15.0.2110.106
                                   Available with Ubuntu Pro
   linux-image-azure-fips-4.15     4.15.0.2110.106
                                   Available with Ubuntu Pro
   linux-image-azure-lts-18.04     4.15.0.1201.169
                                   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-8281-2
   https://ubuntu.com/security/notices/USN-8281-1
   CVE-2026-31431, CVE-2026-31504, CVE-2026-43033, CVE-2026-43077,
   CVE-2026-43078



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