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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

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS 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 ...

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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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