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Ubuntu Security Notice USN-7850-1
October 30, 2025

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)

A security issues was discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystem:
   - USB sound devices;
(CVE-2024-53150)

Update instructions:

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

Ubuntu 14.04 LTS
   linux-image-3.13.0-208-generic  3.13.0-208.259
                                   Available with Ubuntu Pro
   linux-image-3.13.0-208-lowlatency  3.13.0-208.259
                                   Available with Ubuntu Pro
   linux-image-generic             3.13.0.208.218
                                   Available with Ubuntu Pro
   linux-image-generic-lts-trusty  3.13.0.208.218
                                   Available with Ubuntu Pro
   linux-image-lowlatency          3.13.0.208.218
                                   Available with Ubuntu Pro
   linux-image-server              3.13.0.208.218
                                   Available with Ubuntu Pro
   linux-image-virtual             3.13.0.208.218
                                   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-7850-1
   CVE-2024-53150, CVE-2025-40300