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Ubuntu Security Notice USN-7819-1
October 13, 2025

linux-azure, linux-azure-5.4 vulnerabilities
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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-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:
  - Network drivers;
  - Device tree and open firmware driver;
  - SCSI subsystem;
  - TTY drivers;
  - Ext4 file system;
  - Network file system (NFS) server daemon;
  - SMB network file system;
  - Bluetooth subsystem;
  - Packet sockets;
  - Network traffic control;
  - VMware vSockets driver;
(CVE-2025-38350, CVE-2024-57996, CVE-2025-37752, CVE-2025-38617,
CVE-2025-38477, CVE-2025-38083, CVE-2024-38541, CVE-2023-52757,
CVE-2023-52975, CVE-2025-38618, CVE-2024-49950, CVE-2024-50073,
CVE-2025-37785, CVE-2025-21796, CVE-2025-38683, CVE-2025-37797)

Update instructions:

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

Ubuntu 20.04 LTS
  linux-image-5.4.0-1154-azure    5.4.0-1154.161
                                  Available with Ubuntu Pro
  linux-image-azure-5.4           5.4.0.1154.148
                                  Available with Ubuntu Pro
  linux-image-azure-lts-20.04     5.4.0.1154.148
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  linux-image-5.4.0-1154-azure    5.4.0-1154.161~18.04.1
                                  Available with Ubuntu Pro
  linux-image-azure               5.4.0.1154.161~18.04.1
                                  Available with Ubuntu Pro
  linux-image-azure-5.4           5.4.0.1154.161~18.04.1
                                  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-7819-1
  CVE-2023-52757, CVE-2023-52975, CVE-2024-38541, CVE-2024-49950,
  CVE-2024-50073, CVE-2024-57996, CVE-2025-21796, CVE-2025-37752,
  CVE-2025-37785, CVE-2025-37797, CVE-2025-38083, CVE-2025-38350,
  CVE-2025-38477, CVE-2025-38617, CVE-2025-38618, CVE-2025-38683