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CVE-2025-38560

9.3 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Evict cache lines during SNP memory validation An SNP cache coherency vulnerability requires a cache line eviction mit…

Published Aug 19, 2025EPSS 0.17%

Overview

CVE-2025-38560 is a critical-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

x86/sev: Evict cache lines during SNP memory validation

An SNP cache coherency vulnerability requires a cache line eviction

mitigation when validating memory after a page state change to private.

The specific mitigation is to touch the first and last byte of each 4K

page that is being validated. There is no need to perform the mitigation

when performing a page state change to shared and rescinding validation.

CPUID bit Fn8000001F_EBX[31] defines the COHERENCY_SFW_NO CPUID bit

that, when set, indicates that the software mitigation for this

vulnerability is not needed.

Implement the mitigation and invoke it when validating memory (making it

private) and the COHERENCY_SFW_NO bit is not set, indicating the SNP

guest is vulnerable.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022Refgit.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6aRefgit.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1eRefgit.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8Refgit.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdfRefgit.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45bReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38560?

CVE-2025-38560 is a critical-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2025-38560?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-38560?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38560?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38560 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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