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Ubuntu 16.04 LTS: Linux Kernel Critical VMSCAPE Info Leak 2025:7863-1

ubuntu
Calendar Grey November 6, 2025
Dist Ubuntu Esm H88
Updates for Ubuntu fix multiple Linux kernel issues including potential information leakage and DDoS vulnerabilities.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-kvm: Linux kernel for cloud environments

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

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)

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:

- DMA engine subsystem;

- GPU drivers;

- HSI subsystem;

- Ethernet team driver;

- TTY drivers;

- Ext4 file ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service information leak critical Ubuntu Linux kernel

Update Instructions

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

Ubuntu 16.04 LTS
   linux-image-4.4.0-1150-kvm      4.4.0-1150.161
                                   Available with Ubuntu Pro
   linux-image-4.4.0-1187-aws      4.4.0-1187.202
                                   Available with Ubuntu Pro
   linux-image-4.4.0-274-generic   4.4.0-274.308
                                   Available with Ubuntu Pro
   linux-image-4.4.0-274-lowlatency  4.4.0-274.308
                                   Available with Ubuntu Pro
   linux-image-aws                 4.4.0.1187.191
                                   Available with Ubuntu Pro
   linux-image-generic             4.4.0.274.280
                                   Available with Ubuntu Pro
   linux-image-generic-lts-xenial  4.4.0.274.280
                                   Available with Ubuntu Pro
   linux-image-kvm                 4.4.0.1150.147
                                   Available with Ubuntu Pro
   linux-image-lowlatency          4.4.0.274.280
                                   Available with Ubuntu Pro
   linux-image-lowlatency-lts-xenial  4.4.0.274.280
                                   Available with Ubuntu Pro
   linux-image-virtual             4.4.0.274.280
                                   Available with Ubuntu Pro
   linux-image-virtual-lts-xenial  4.4.0.274.280
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   linux-image-4.4.0-1149-aws      4.4.0-1149.155
                                   Available with Ubuntu Pro
   linux-image-4.4.0-274-generic   4.4.0-274.308~14.04.1
                                   Available with Ubuntu Pro
   linux-image-4.4.0-274-lowlatency  4.4.0-274.308~14.04.1
                                   Available with Ubuntu Pro
   linux-image-aws                 4.4.0.1149.146
                                   Available with Ubuntu Pro
   linux-image-generic-lts-xenial  4.4.0.274.308~14.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-lts-xenial  4.4.0.274.308~14.04.1
                                   Available with Ubuntu Pro
   linux-image-virtual-lts-xenial  4.4.0.274.308~14.04.1
                                   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-7863-1

CVE-2021-47294, CVE-2021-47330, CVE-2023-52574, CVE-2023-52650,

CVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150,

CVE-2024-56767, CVE-2025-37838, CVE-2025-38352, CVE-2025-40300

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7863-1

Topics%20covered

Topics Covered

security advisory denial of service information leak critical Ubuntu Linux kernel

Package Information

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