9.3

CVE-2025-38560: x86/sev: Evict cache lines during SNP memory validation

Modified
AliasesUBUNTU-CVE-2025-38560DEBIAN-CVE-2025-38560
Published 19-08-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-38560 is a critical (CVSS 9.3) vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.3 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.3/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 45 · Related 42
DLA-4328-1MGASA-2025-0234MGASA-2025-0235OPENSUSE-SU-2025:20081-1SUSE-SU-2025:03272-1SUSE-SU-2025:03283-1

Timeline

  1. 19-08-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu122 products
  • linux< 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.148-1 | < 6.12.43-1 | < 6.16.3-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684, < 1fec416c03d0a64cc21aa04ce4aa14254b017e6a | ≥ 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684, < 1fb873971e23c35c53823c62809a474a92bc3022 | ≥ 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684, < aed15fc08f15dbb15822b2a0b653f67e76aa0fdf | ≥ 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684, < a762a4c8d9e768b538b3cc60615361a8cf377de8 | ≥ 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684, < f92af52e6dbd8d066d77beba451e0230482dc45b | ≥ 4f9c403e44e5e88feb27d5e617d1adc9cc7ef684, < 7b306dfa326f70114312b320d083b21fa9481e1e | 5.19
  • 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

3 vendors · 126 products

References

34 links
Show all 34 references