[USN-8644-3] Linux kernel (Azure) vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-8644-3
August 27, 2026

linux-azure, linux-azure-4.15, linux-azure-fips vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 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
- linux-azure: 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:
   - File systems infrastructure;
   - OCFS2 file system;
   - B.A.T.M.A.N. meshing protocol;
   - SCTP protocol;
   - TIPC protocol;
(CVE-2026-43071, CVE-2026-52914, CVE-2026-52993, CVE-2026-53043,
CVE-2026-53224, CVE-2026-53246, CVE-2026-53309)

Update instructions:

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

Ubuntu 18.04 LTS
   linux-image-4.15.0-1206-azure   4.15.0-1206.221
                                   Available with Ubuntu Pro
   linux-image-4.15.0-2114-azure-fips  4.15.0-2114.120
                                   Available with Ubuntu Pro
   linux-image-azure-4.15          4.15.0.1206.174
                                   Available with Ubuntu Pro
   linux-image-azure-fips          4.15.0.2114.110
                                   Available with Ubuntu Pro
   linux-image-azure-fips-4.15     4.15.0.2114.110
                                   Available with Ubuntu Pro
   linux-image-azure-lts-18.04     4.15.0.1206.174
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   linux-image-4.15.0-1206-azure   4.15.0-1206.221~16.04.1
                                   Available with Ubuntu Pro
   linux-image-azure               4.15.0.1206.221~16.04.1
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   linux-image-4.15.0-1206-azure   4.15.0-1206.221~14.04.1
                                   Available with Ubuntu Pro
   linux-image-azure               4.15.0.1206.221~14.04.1
                                   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-8644-3
   https://ubuntu.com/security/notices/USN-8644-2
   https://ubuntu.com/security/notices/USN-8644-1
   CVE-2026-43071, CVE-2026-52914, CVE-2026-52993, CVE-2026-53043,
   CVE-2026-53224, CVE-2026-53246, CVE-2026-53309

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