CVE-2025-38560

MEDIUM EPSS 4.9%
Published Aug 19, 202510mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Aug 19, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥5.19  –  <6.1.148
linuxlinux_kernel*≥6.2  –  <6.6.102
linuxlinux_kernel*≥6.7  –  <6.12.42
linuxlinux_kernel*≥6.13  –  <6.15.10
linuxlinux_kernel*≥6.16  –  <6.16.1
linuxlinux_kernel6.17any
debiandebian_linux11.0any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45b
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45b
    Patch