ghsa-fppf-vq4v-6j7g
Vulnerability from github
Published
2025-09-11 18:35
Modified
2025-09-11 18:35
Details

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

mm/smaps: fix race between smaps_hugetlb_range and migration

smaps_hugetlb_range() handles the pte without holdling ptl, and may be concurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page(). The race is as follows.

smaps_hugetlb_range migrate_pages huge_ptep_get remove_migration_ptes folio_unlock pfn_swap_entry_folio BUG_ON

To fix it, hold ptl lock in smaps_hugetlb_range().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39754"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-11T17:15:39Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/smaps: fix race between smaps_hugetlb_range and migration\n\nsmaps_hugetlb_range() handles the pte without holdling ptl, and may be\nconcurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page(). \nThe race is as follows.\n\nsmaps_hugetlb_range              migrate_pages\n  huge_ptep_get\n                                   remove_migration_ptes\n\t\t\t\t   folio_unlock\n  pfn_swap_entry_folio\n    BUG_ON\n\nTo fix it, hold ptl lock in smaps_hugetlb_range().",
  "id": "GHSA-fppf-vq4v-6j7g",
  "modified": "2025-09-11T18:35:51Z",
  "published": "2025-09-11T18:35:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39754"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09fc018f48871123ad5dbd7b03c956580232ed76"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a1f3663974162b8f1e098196f557cfc1d160138"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45d19b4b6c2d422771c29b83462d84afcbb33f01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b625883ccbcc2b57808db51d1375b1d7b9bcb3e5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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