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Ubuntu 18.04: Significant VMSCAPE Details in Linux Kernel USN-7853-1

ubuntu
Calendar Grey October 30, 2025
Dist Ubuntu Esm H88
Update your Ubuntu systems to mitigate important kernel flaws affecting cloud deployments. Protect sensitive data now.
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-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-oracle: Linux kernel for Oracle Cloud systems

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

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) 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)

Several security issues were discovered in the Linux kernel.

An attacker could possibly use these to compromise the sys...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory Ubuntu important kernel information disclosure guest vm attack

Update Instructions

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

Ubuntu 18.04 LTS
   linux-image-4.15.0-1148-oracle  4.15.0-1148.159
                                   Available with Ubuntu Pro
   linux-image-4.15.0-1179-gcp     4.15.0-1179.196
                                   Available with Ubuntu Pro
   linux-image-4.15.0-1186-aws     4.15.0-1186.199
                                   Available with Ubuntu Pro
   linux-image-4.15.0-243-generic  4.15.0-243.255
                                   Available with Ubuntu Pro
   linux-image-4.15.0-243-lowlatency  4.15.0-243.255
                                   Available with Ubuntu Pro
   linux-image-aws-4.15            4.15.0.1186.184
                                   Available with Ubuntu Pro
   linux-image-aws-lts-18.04       4.15.0.1186.184
                                   Available with Ubuntu Pro
   linux-image-gcp-4.15            4.15.0.1179.192
                                   Available with Ubuntu Pro
   linux-image-gcp-lts-18.04       4.15.0.1179.192
                                   Available with Ubuntu Pro
   linux-image-generic             4.15.0.243.227
                                   Available with Ubuntu Pro
   linux-image-lowlatency          4.15.0.243.227
                                   Available with Ubuntu Pro
   linux-image-oracle-4.15         4.15.0.1148.153
                                   Available with Ubuntu Pro
   linux-image-oracle-lts-18.04    4.15.0.1148.153
                                   Available with Ubuntu Pro
   linux-image-virtual             4.15.0.243.227
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   linux-image-4.15.0-1179-gcp     4.15.0-1179.196~16.04.1
                                   Available with Ubuntu Pro
   linux-image-4.15.0-1186-aws     4.15.0-1186.199~16.04.1
                                   Available with Ubuntu Pro
   linux-image-4.15.0-243-generic  4.15.0-243.255~16.04.1
                                   Available with Ubuntu Pro
   linux-image-4.15.0-243-lowlatency  4.15.0-243.255~16.04.1
                                   Available with Ubuntu Pro
   linux-image-aws-hwe             4.15.0.1186.199~16.04.1
                                   Available with Ubuntu Pro
   linux-image-gcp                 4.15.0.1179.196~16.04.1
                                   Available with Ubuntu Pro
   linux-image-generic-hwe-16.04   4.15.0.243.255~16.04.1
                                   Available with Ubuntu Pro
   linux-image-gke                 4.15.0.1179.196~16.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-hwe-16.04  4.15.0.243.255~16.04.1
                                   Available with Ubuntu Pro
   linux-image-oem                 4.15.0.243.255~16.04.1
                                   Available with Ubuntu Pro
   linux-image-virtual-hwe-16.04   4.15.0.243.255~16.04.1
                                   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-7853-1

CVE-2023-52574, CVE-2023-52650, CVE-2024-41006, 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
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7853-1

Topics%20covered

Topics Covered

security advisory Ubuntu important kernel information disclosure guest vm attack

Package Information

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