CVE-2025-38560 Details
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.
A vulnerability in the Linux kernel's handling of Secure Nested Paging (SNP) can lead to cache coherency issues. This vulnerability requires a specific mitigation—evicting cache lines—when validating memory after a page state change to private. The mitigation involves touching the first and last byte of each 4K page being validated. The vulnerability is present in the Linux kernel's stable releases, specifically in the x86 architecture with AMD processors that support SEV (Secure Encrypted Virtualization). The vulnerability arises because, after changing a page's state to private, the cache lines can become inconsistent, potentially leading to data leakage or corruption.
The vulnerability has been addressed in the Linux kernel by implementing the cache line eviction mitigation. Users should ensure they are running a version of the kernel that includes this mitigation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022 | kernel.org | Patch |
| https://git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6a | kernel.org | Patch |
| https://git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1e | kernel.org | Patch |
| https://git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8 | kernel.org | Patch |
| https://git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdf | kernel.org | Patch |
| https://git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45b | kernel.org | Patch |
| https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html | CVE | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.19, < 6.1.148 >= 6.2, < 6.6.102 >= 6.7, < 6.12.42 >= 6.13, < 6.15.10 >= 6.16, < 6.16.1 6.17 rc1 |
CPE
Remediation
| |
| debian debian linux | 11.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jan 22, 2026 | Initial Analysis | [email protected] |
| Nov 3, 2025 | CVE Modified | CVE |
| Aug 19, 2025 | New CVE Received | kernel.org |