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Ubuntu Security Notice USN-7607-3
July 08, 2025

linux-kvm vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-kvm: Linux kernel for cloud environments

Details:

It was discovered that a use-after-free vulnerability existed in the
Bluetooth stack in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2022-3640)

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:
   - SCSI subsystem;
   - Network file system (NFS) client;
   - NILFS2 file system;
   - File systems infrastructure;
   - Memory management;
   - Bluetooth subsystem;
   - Network traffic control;
   - USB sound devices;
(CVE-2024-50116, CVE-2021-47576, CVE-2024-53197, CVE-2024-46787,
CVE-2025-37798, CVE-2024-49958, CVE-2021-47260, CVE-2025-37932,
CVE-2022-49909)

Update instructions:

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

Ubuntu 16.04 LTS
   linux-image-4.4.0-1146-kvm      4.4.0-1146.157
                                   Available with Ubuntu Pro
   linux-image-kvm                 4.4.0.1146.143
                                   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-7607-3
   https://ubuntu.com/security/notices/USN-7607-2
   https://ubuntu.com/security/notices/USN-7607-1
   CVE-2021-47260, CVE-2021-47576, CVE-2022-3640, CVE-2022-49909,
   CVE-2024-46787, CVE-2024-49958, CVE-2024-50116, CVE-2024-53197,
   CVE-2025-37798, CVE-2025-37932