ghsa-vwc5-3f53-7rhp
Vulnerability from github
Published
2025-09-05 18:31
Modified
2025-09-05 18:31
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]

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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": null
  },
  "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": "2025-09-05T18:31:15Z",
  "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": []
}


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