Vulnerability-Lookup

GHSA-VWC5-3F53-7RHP

Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2025-11-24 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry

When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swp_entry_t. Add the missing check and let split_huge_pmd() handle migration entries. While at it also remove unnecessary folio check.

[surenb@google.com: remove extra folio check, per David]

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38686"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-04T16:15:36Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry\n\nWhen UFFDIO_MOVE encounters a migration PMD entry, it proceeds with\nobtaining a folio and accessing it even though the entry is swp_entry_t. \nAdd the missing check and let split_huge_pmd() handle migration entries. \nWhile at it also remove unnecessary folio check.\n\n[surenb@google.com: remove extra folio check, per David]",
  "id": "GHSA-vwc5-3f53-7rhp",
  "modified": "2025-11-24T21:30:56Z",
  "published": "2025-09-05T18:31:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38686"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38686 (GCVE-0-2025-38686)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-05-11 21:33

Title

userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry

Summary

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swp_entry_t. Add the missing check and let split_huge_pmd() handle migration entries. While at it also remove unnecessary folio check. [surenb@google.com: remove extra folio check, per David]

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/bb81c18dbd42650c8…
https://git.kernel.org/stable/c/1202abad7a7ccd28c…
https://git.kernel.org/stable/c/7f1101a0a181243ad…
https://git.kernel.org/stable/c/aba6faec0103ed8f1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: adef440691bab824e39c1b17382322d195e1fab0 , < bb81c18dbd42650c844e160cafa7cbb20243a96a (git) Affected: adef440691bab824e39c1b17382322d195e1fab0 , < 1202abad7a7ccd28c426d2844771a387b07629a4 (git) Affected: adef440691bab824e39c1b17382322d195e1fab0 , < 7f1101a0a181243ad587ececdffc4845f035549f (git) Affected: adef440691bab824e39c1b17382322d195e1fab0 , < aba6faec0103ed8f169be8dce2ead41fcb689446 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.43 , ≤ 6.12.* (semver) Unaffected: 6.15.11 , ≤ 6.15.* (semver) Unaffected: 6.16.2 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "mm/userfaultfd.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "adef440691bab824e39c1b17382322d195e1fab0",
              "versionType": "git"
            },
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              "status": "affected",
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            },
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              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.43",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.11",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.16.*",
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              "version": "6.16.2",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
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              "versionType": "original_commit_for_fix"
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    "dateReserved": "2025-04-16T04:51:24.032Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-VWC5-3F53-7RHP

CVE-2025-38686 (GCVE-0-2025-38686)

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