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Ubuntu 24.04 LTS: Linux Kernel Critical Info Disclosure Vuln USN-7861-1

ubuntu
Calendar Grey November 6, 2025
Dist Ubuntu Esm H88
Security vulnerabilities have been addressed in the Linux kernel for Ubuntu 22.04 and 24.04 LTS systems, boosting safety.
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-gkeop: Linux kernel for Google Container Engine (GKE) systems

- linux-ibm: Linux kernel for IBM cloud systems

- linux-lowlatency: Linux low latency kernel

- linux-nvidia: Linux kernel for NVIDIA systems

- linux-nvidia-lowlatency: Linux low latency kernel for NVIDIA systems

- linux-hwe-6.8: Linux hardware enablement (HWE) kernel

- linux-ibm-6.8: Linux kernel for IBM cloud systems

- linux-lowlatency-hwe-6.8: Linux low latency 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.

Severa...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical memory corruption Ubuntu kernel information disclosure

Update Instructions

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

Ubuntu 24.04 LTS
   linux-image-6.8.0-1026-gkeop    6.8.0-1026.29
   linux-image-6.8.0-1040-ibm      6.8.0-1040.40
   linux-image-6.8.0-1042-aws      6.8.0-1042.44
   linux-image-6.8.0-1042-aws-64k  6.8.0-1042.44
   linux-image-6.8.0-1042-nvidia   6.8.0-1042.45+1
   linux-image-6.8.0-1042-nvidia-64k  6.8.0-1042.45+1
   linux-image-6.8.0-1042-nvidia-lowlatency  6.8.0-1042.45.1
   linux-image-6.8.0-1042-nvidia-lowlatency-64k  6.8.0-1042.45.1
   linux-image-6.8.0-87-generic    6.8.0-87.88
   linux-image-6.8.0-87-generic-64k  6.8.0-87.88
   linux-image-6.8.0-87-lowlatency  6.8.0-87.88.1
   linux-image-6.8.0-87-lowlatency-64k  6.8.0-87.88.1
   linux-image-aws-6.8             6.8.0-1042.44
   linux-image-aws-64k-6.8         6.8.0-1042.44
   linux-image-aws-64k-lts-24.04   6.8.0-1042.44
   linux-image-aws-lts-24.04       6.8.0-1042.44
   linux-image-generic             6.8.0-87.88
   linux-image-generic-6.8         6.8.0-87.88
   linux-image-generic-64k         6.8.0-87.88
   linux-image-generic-64k-6.8     6.8.0-87.88
   linux-image-generic-lpae        6.8.0-87.88
   linux-image-gkeop               6.8.0-1026.29
   linux-image-gkeop-6.8           6.8.0-1026.29
   linux-image-ibm                 6.8.0-1040.40
   linux-image-ibm-6.8             6.8.0-1040.40
   linux-image-ibm-classic         6.8.0-1040.40
   linux-image-ibm-lts-24.04       6.8.0-1040.40
   linux-image-kvm                 6.8.0-87.88
   linux-image-lowlatency          6.8.0-87.88.1
   linux-image-lowlatency-6.8      6.8.0-87.88.1
   linux-image-lowlatency-64k      6.8.0-87.88.1
   linux-image-lowlatency-64k-6.8  6.8.0-87.88.1
   linux-image-nvidia              6.8.0-1042.45
   linux-image-nvidia-6.8          6.8.0-1042.45
   linux-image-nvidia-64k          6.8.0-1042.45
   linux-image-nvidia-64k-6.8      6.8.0-1042.45
   linux-image-nvidia-lowlatency   6.8.0-1042.45.1
   linux-image-nvidia-lowlatency-6.8  6.8.0-1042.45.1
   linux-image-nvidia-lowlatency-64k  6.8.0-1042.45.1
   linux-image-nvidia-lowlatency-64k-6.8  6.8.0-1042.45.1
   linux-image-virtual             6.8.0-87.88
   linux-image-virtual-6.8         6.8.0-87.88

Ubuntu 22.04 LTS
   linux-image-6.8.0-1040-ibm      6.8.0-1040.40~22.04.1
   linux-image-6.8.0-87-generic    6.8.0-87.88~22.04.1
   linux-image-6.8.0-87-lowlatency  6.8.0-87.88.1~22.04.1
   linux-image-6.8.0-87-lowlatency-64k  6.8.0-87.88.1~22.04.1
   linux-image-generic-6.8         6.8.0-87.88~22.04.1
   linux-image-generic-64k-6.8     6.8.0-87.88~22.04.1
   linux-image-generic-64k-hwe-22.04  6.8.0-87.88~22.04.1
   linux-image-generic-hwe-22.04   6.8.0-87.88~22.04.1
   linux-image-ibm-6.8             6.8.0-1040.40~22.04.1
   linux-image-lowlatency-6.8      6.8.0-87.88.1~22.04.1
   linux-image-lowlatency-64k-6.8  6.8.0-87.88.1~22.04.1
   linux-image-lowlatency-64k-hwe-22.04  6.8.0-87.88.1~22.04.1
   linux-image-lowlatency-hwe-22.04  6.8.0-87.88.1~22.04.1
   linux-image-oem-22.04           6.8.0-87.88~22.04.1
   linux-image-oem-22.04a          6.8.0-87.88~22.04.1
   linux-image-oem-22.04b          6.8.0-87.88~22.04.1
   linux-image-oem-22.04c          6.8.0-87.88~22.04.1
   linux-image-oem-22.04d          6.8.0-87.88~22.04.1
   linux-image-virtual-6.8         6.8.0-87.88~22.04.1
   linux-image-virtual-hwe-22.04   6.8.0-87.88~22.04.1

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-7861-1

CVE-2025-37838, CVE-2025-38118, CVE-2025-38352, CVE-2025-40300

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7861-1

Topics%20covered

Topics Covered

security advisory critical memory corruption Ubuntu kernel information disclosure

Package Information

https://launchpad.net/ubuntu/+source/linux-ibm/6.8.0-1040.40
https://launchpad.net/ubuntu/+source/linux-hwe-6.8/6.8.0-87.88~22.04.1
https://launchpad.net/ubuntu/+source/linux-ibm-6.8/6.8.0-1040.40~22.04.1

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