CVE-2025-37818 (GCVE-0-2025-37818)
Vulnerability from cvelistv5
Published
2025-05-08 06:26
Modified
2025-05-26 05:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: Return NULL from huge_pte_offset() for invalid PMD LoongArch's huge_pte_offset() currently returns a pointer to a PMD slot even if the underlying entry points to invalid_pte_table (indicating no mapping). Callers like smaps_hugetlb_range() fetch this invalid entry value (the address of invalid_pte_table) via this pointer. The generic is_swap_pte() check then incorrectly identifies this address as a swap entry on LoongArch, because it satisfies the "!pte_present() && !pte_none()" conditions. This misinterpretation, combined with a coincidental match by is_migration_entry() on the address bits, leads to kernel crashes in pfn_swap_entry_to_page(). Fix this at the architecture level by modifying huge_pte_offset() to check the PMD entry's content using pmd_none() before returning. If the entry is invalid (i.e., it points to invalid_pte_table), return NULL instead of the pointer to the slot.
References
Impacted products
Vendor Product Version
Linux Linux Version: fa96b57c149061f71a70bd6582d995f6424fbbf4
Version: fa96b57c149061f71a70bd6582d995f6424fbbf4
Version: fa96b57c149061f71a70bd6582d995f6424fbbf4
Version: fa96b57c149061f71a70bd6582d995f6424fbbf4
Version: fa96b57c149061f71a70bd6582d995f6424fbbf4
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/mm/hugetlbpage.c"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.89",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.26",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                {
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Return NULL from huge_pte_offset() for invalid PMD\n\nLoongArch\u0027s huge_pte_offset() currently returns a pointer to a PMD slot\neven if the underlying entry points to invalid_pte_table (indicating no\nmapping). Callers like smaps_hugetlb_range() fetch this invalid entry\nvalue (the address of invalid_pte_table) via this pointer.\n\nThe generic is_swap_pte() check then incorrectly identifies this address\nas a swap entry on LoongArch, because it satisfies the \"!pte_present()\n\u0026\u0026 !pte_none()\" conditions. This misinterpretation, combined with a\ncoincidental match by is_migration_entry() on the address bits, leads to\nkernel crashes in pfn_swap_entry_to_page().\n\nFix this at the architecture level by modifying huge_pte_offset() to\ncheck the PMD entry\u0027s content using pmd_none() before returning. If the\nentry is invalid (i.e., it points to invalid_pte_table), return NULL\ninstead of the pointer to the slot."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:21:32.260Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73"
        }
      ],
      "title": "LoongArch: Return NULL from huge_pte_offset() for invalid PMD",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37818",
    "datePublished": "2025-05-08T06:26:13.322Z",
    "dateReserved": "2025-04-16T04:51:23.947Z",
    "dateUpdated": "2025-05-26T05:21:32.260Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37818\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-08T07:15:53.040\",\"lastModified\":\"2025-05-08T14:39:09.683\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nLoongArch: Return NULL from huge_pte_offset() for invalid PMD\\n\\nLoongArch\u0027s huge_pte_offset() currently returns a pointer to a PMD slot\\neven if the underlying entry points to invalid_pte_table (indicating no\\nmapping). Callers like smaps_hugetlb_range() fetch this invalid entry\\nvalue (the address of invalid_pte_table) via this pointer.\\n\\nThe generic is_swap_pte() check then incorrectly identifies this address\\nas a swap entry on LoongArch, because it satisfies the \\\"!pte_present()\\n\u0026\u0026 !pte_none()\\\" conditions. This misinterpretation, combined with a\\ncoincidental match by is_migration_entry() on the address bits, leads to\\nkernel crashes in pfn_swap_entry_to_page().\\n\\nFix this at the architecture level by modifying huge_pte_offset() to\\ncheck the PMD entry\u0027s content using pmd_none() before returning. If the\\nentry is invalid (i.e., it points to invalid_pte_table), return NULL\\ninstead of the pointer to the slot.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: LoongArch: Devuelve NULL desde huge_pte_offset() para PMD no v\u00e1lido. La funci\u00f3n huge_pte_offset() de LoongArch actualmente devuelve un puntero a una ranura PMD incluso si la entrada subyacente apunta a invalid_pte_table (lo que indica que no hay asignaci\u00f3n). Llamadores como smaps_hugetlb_range() obtienen este valor de entrada no v\u00e1lido (la direcci\u00f3n de invalid_pte_table) a trav\u00e9s de este puntero. La comprobaci\u00f3n gen\u00e9rica is_swap_pte() identifica incorrectamente esta direcci\u00f3n como una entrada de intercambio en LoongArch, ya que cumple las condiciones \\\"!pte_present() \u0026amp;\u0026amp; !pte_none()\\\". Esta interpretaci\u00f3n err\u00f3nea, combinada con una coincidencia de is_migration_entry() en los bits de direcci\u00f3n, provoca fallos del kernel en pfn_swap_entry_to_page(). Solucione esto a nivel de arquitectura modificando huge_pte_offset() para comprobar el contenido de la entrada PMD mediante pmd_none() antes de regresar. Si la entrada no es v\u00e1lida (es decir, apunta a invalid_pte_table), devuelva NULL en lugar del puntero a la ranura.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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