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Ubuntu 25.10: Linux Kernel Important Security Threat USN-7906

Linuxsecurity •LinuxSecurity Advisories • December 3, 2025

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 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-realtime: Linux kernel for Real-time systems Details: 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: - x86 architecture; - Cryptographic API; - Android drivers; - TTY drivers; - F2FS file system; - 9P file system network protocol; (CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028, CVE-2025-40108, CVE-2025-40109)

The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 linux-image-6.17.0-1003-realtime 6.17.0-1003.4 linux-image-6.17.0-1004-aws 6.17.0-1004.4 linux-image-6.17.0-1004-aws-64k 6.17.0-1004.4 linux-image-6.17.0-7-generic 6.17.0-7.7 linux-image-6.17.0-7-generic-64k 6.17.0-7.7 linux-image-aws 6.17.0-1004.4 linux-image-aws-6.17 6.17.0-1004.4 linux-image-aws-64k 6.17.0-1004.4 linux-image-aws-64k-6.17 6.17.0-1004.4 linux-image-generic 6.17.0-7.7 linux-image-generic-6.17 6.17.0-7.7 linux-image-generic-64k 6.17.0-7.7 linux-image-generic-64k-6.17 6.17.0-7.7 linux-image-generic-64k-hwe-24.04 6.17.0-7.7 linux-image-generic-hwe-24.04 6.17.0-7.7 linux-image-oem-24.04 6.17.0-7.7 linux-image-oem-24.04c 6.17.0-7.7 linux-image-realtime 6.17.0-1003.4 linux-image-realtime-6.17 6.17.0-1003.4 linux-image-realtime-hwe-24.04 6.17.0-1003.4 linux-image-virtual 6.17.0-7.7 linux-image-virtual-6.17 6.17.0-7.7 linux-image-virtual-hwe-24.04 6.17.0-7.7 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.

CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028, CVE-2025-40108, CVE-2025-40109

CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028,

CVE-2025-40108, CVE-2025-40109

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Linux Kernel Vulnerabilities Expose Sensitive Information via VMSCAPE A series of vulnerabilities in the Linux kernel, identified by researchers Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi, allow attackers in guest virtual machines to potentially expose sensitive information from the host operating system. This flaw, known as VMSCAPE, affects various Linux kernel versions and has been linked to insufficient branch predictor isolation. Multiple updates have been issued to address these vulnerabilities. 90 sources 16

Extracted Entities

Ubuntu 25.10: Linux Kernel Important Security Threat USN-7906

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Extracted Entities

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CVEs (6)

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