x86/sev: Evict cache lines during SNP memory validation
Summary
| CVE | CVE-2025-38560 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-08-19 17:15:32 UTC |
| Updated | 2026-10-15 22:18:45 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Problem Types: NVD-CWE-noinfo
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 9.3 | CRITICAL | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 9.3 | CRITICAL | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684 1fec416c03d0a64cc21aa04ce4aa14254b017e6a git | Not specified |
| CNA | Linux | Linux | affected 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684 1fb873971e23c35c53823c62809a474a92bc3022 git | Not specified |
| CNA | Linux | Linux | affected 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684 aed15fc08f15dbb15822b2a0b653f67e76aa0fdf git | Not specified |
| CNA | Linux | Linux | affected 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684 a762a4c8d9e768b538b3cc60615361a8cf377de8 git | Not specified |
| CNA | Linux | Linux | affected 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684 f92af52e6dbd8d066d77beba451e0230482dc45b git | Not specified |
| CNA | Linux | Linux | affected 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684 7b306dfa326f70114312b320d083b21fa9481e1e git | Not specified |
| CNA | Linux | Linux | affected 5.19 | Not specified |
| CNA | Linux | Linux | unaffected 5.19 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.148 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.102 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.42 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.15.10 6.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.16.1 6.16.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.17 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| lists.debian.org/debian-lts-announce/2025/10/msg00008.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Third Party Advisory |
| git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.