[USN-7553-4] Linux kernel (Azure) vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7553-4
June 09, 2025

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

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 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: 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:
  - Clock framework and drivers;
  - GPU drivers;
  - Parport drivers;
  - Ext4 file system;
  - JFFS2 file system;
  - JFS file system;
  - File systems infrastructure;
  - Sun RPC protocol;
  - USB sound devices;
(CVE-2024-57850, CVE-2024-42301, CVE-2024-53155, CVE-2024-53168,
CVE-2024-26966, CVE-2021-47211, CVE-2024-56596, CVE-2024-56551,
CVE-2024-47701)

Update instructions:

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1189-azure   4.15.0-1189.204
                                  Available with Ubuntu Pro
  linux-image-azure-lts-18.04     4.15.0.1189.157
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  linux-image-4.15.0-1189-azure   4.15.0-1189.204~16.04.1
                                  Available with Ubuntu Pro
  linux-image-azure               4.15.0.1189.204~16.04.1
                                  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-7553-4
  https://ubuntu.com/security/notices/USN-7553-3
  https://ubuntu.com/security/notices/USN-7553-2
  https://ubuntu.com/security/notices/USN-7553-1
  CVE-2021-47211, CVE-2024-26966, CVE-2024-42301, CVE-2024-47701,
  CVE-2024-53155, CVE-2024-53168, CVE-2024-56551, CVE-2024-56596,
  CVE-2024-57850

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