[USN-7907-5] Linux kernel kernel vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-7907-5
December 12, 2025

linux-azure, linux-azure-4.15, linux-oracle, 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: Linux kernel for Microsoft Azure Cloud systems
- linux-oracle: Linux kernel for Oracle 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;
   - ACPI drivers;
   - Hardware monitoring drivers;
   - InfiniBand drivers;
   - Mailbox framework;
   - Network drivers;
   - AFS file system;
   - Ceph distributed file system;
   - Network file system (NFS) server daemon;
   - NILFS2 file system;
   - File systems infrastructure;
   - KVM subsystem;
   - L3 Master device support module;
   - Tracing infrastructure;
   - Memory management;
   - Appletalk network protocol;
   - Netfilter;
   - Open vSwitch;
(CVE-2021-47385, CVE-2022-49026, CVE-2022-49390, CVE-2024-49935,
CVE-2024-49963, CVE-2024-50067, CVE-2024-50095, CVE-2024-50179,
CVE-2024-53090, CVE-2024-53112, CVE-2024-53217, CVE-2024-58083,
CVE-2025-21715, CVE-2025-21722, CVE-2025-21761, CVE-2025-21791,
CVE-2025-21811, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666,
CVE-2025-39964, CVE-2025-40018)

Update instructions:

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

Ubuntu 18.04 LTS
   linux-image-4.15.0-1195-azure   4.15.0-1195.210
                                   Available with Ubuntu Pro
   linux-image-azure-4.15          4.15.0.1195.163
                                   Available with Ubuntu Pro
   linux-image-azure-lts-18.04     4.15.0.1195.163
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   linux-image-4.15.0-1149-oracle  4.15.0-1149.160~16.04.1
                                   Available with Ubuntu Pro
   linux-image-4.15.0-1195-azure   4.15.0-1195.210~16.04.1
                                   Available with Ubuntu Pro
   linux-image-azure               4.15.0.1195.210~16.04.1
                                   Available with Ubuntu Pro
   linux-image-oracle              4.15.0.1149.160~16.04.1
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   linux-image-4.15.0-1195-azure   4.15.0-1195.210~14.04.1
                                   Available with Ubuntu Pro
   linux-image-azure               4.15.0.1195.210~14.04.1
                                   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-7907-5
   https://ubuntu.com/security/notices/USN-7907-4
   https://ubuntu.com/security/notices/USN-7907-3
   https://ubuntu.com/security/notices/USN-7907-2
   https://ubuntu.com/security/notices/USN-7907-1
   CVE-2021-47385, CVE-2022-49026, CVE-2022-49390, CVE-2024-49935,
   CVE-2024-49963, CVE-2024-50067, CVE-2024-50095, CVE-2024-50179,
   CVE-2024-53090, CVE-2024-53112, CVE-2024-53217, CVE-2024-58083,
   CVE-2025-21715, CVE-2025-21722, CVE-2025-21761, CVE-2025-21791,
   CVE-2025-21811, CVE-2025-21855, CVE-2025-37958, CVE-2025-38666,
   CVE-2025-39964, CVE-2025-40018

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