github - ghsa-rcx5-mm72-w6xv

GHSA-RCX5-MM72-W6XV

Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2025-11-03 18:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38560"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/sev: Evict cache lines during SNP memory validation\n\nAn SNP cache coherency vulnerability requires a cache line eviction\nmitigation when validating memory after a page state change to private.\nThe specific mitigation is to touch the first and last byte of each 4K\npage that is being validated. There is no need to perform the mitigation\nwhen performing a page state change to shared and rescinding validation.\n\nCPUID bit Fn8000001F_EBX[31] defines the COHERENCY_SFW_NO CPUID bit\nthat, when set, indicates that the software mitigation for this\nvulnerability is not needed.\n\nImplement the mitigation and invoke it when validating memory (making it\nprivate) and the COHERENCY_SFW_NO bit is not set, indicating the SNP\nguest is vulnerable.",
  "id": "GHSA-rcx5-mm72-w6xv",
  "modified": "2025-11-03T18:31:33Z",
  "published": "2025-08-19T18:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38560"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45b"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-38560 (GCVE-0-2025-38560)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:02 – Updated: 2025-11-03 17:39

Summary

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/1fec416c03d0a64cc…
	https://git.kernel.org/stable/c/1fb873971e23c35c5…
	https://git.kernel.org/stable/c/aed15fc08f15dbb15…
	https://git.kernel.org/stable/c/a762a4c8d9e768b53…
	https://git.kernel.org/stable/c/f92af52e6dbd8d066…
	https://git.kernel.org/stable/c/7b306dfa326f70114…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1fec416c03d0a64cc21aa04ce4aa14254b017e6a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1fb873971e23c35c53823c62809a474a92bc3022 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aed15fc08f15dbb15822b2a0b653f67e76aa0fdf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a762a4c8d9e768b538b3cc60615361a8cf377de8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f92af52e6dbd8d066d77beba451e0230482dc45b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7b306dfa326f70114312b320d083b21fa9481e1e (git)

Linux

Unaffected: 6.1.148 , ≤ 6.1.* (semver)
Unaffected: 6.6.102 , ≤ 6.6.* (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-RCX5-MM72-W6XV

CVE-2025-38560 (GCVE-0-2025-38560)

Tags

Sightings

Nomenclature