CVE-2025-37996 (GCVE-0-2025-37996)
Vulnerability from cvelistv5
Published
2025-05-29 13:15
Modified
2025-05-29 13:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort() Commit fce886a60207 ("KVM: arm64: Plumb the pKVM MMU in KVM") made the initialization of the local memcache variable in user_mem_abort() conditional, leaving a codepath where it is used uninitialized via kvm_pgtable_stage2_map(). This can fail on any path that requires a stage-2 allocation without transition via a permission fault or dirty logging. Fix this by making sure that memcache is always valid.
References
Impacted products
Vendor Product Version
Linux Linux Version: fce886a6020734d6253c2c5a3bc285e385cc5496
Version: fce886a6020734d6253c2c5a3bc285e385cc5496
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/mmu.c"
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          "vendor": "Linux",
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "6.14",
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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\nKVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()\n\nCommit fce886a60207 (\"KVM: arm64: Plumb the pKVM MMU in KVM\") made the\ninitialization of the local memcache variable in user_mem_abort()\nconditional, leaving a codepath where it is used uninitialized via\nkvm_pgtable_stage2_map().\n\nThis can fail on any path that requires a stage-2 allocation\nwithout transition via a permission fault or dirty logging.\n\nFix this by making sure that memcache is always valid."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-29T13:15:54.956Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18"
        },
        {
          "url": "https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c"
        }
      ],
      "title": "KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37996",
    "datePublished": "2025-05-29T13:15:54.956Z",
    "dateReserved": "2025-04-16T04:51:23.976Z",
    "dateUpdated": "2025-05-29T13:15:54.956Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37996\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-29T14:15:36.183\",\"lastModified\":\"2025-05-29T14:29:50.247\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()\\n\\nCommit fce886a60207 (\\\"KVM: arm64: Plumb the pKVM MMU in KVM\\\") made the\\ninitialization of the local memcache variable in user_mem_abort()\\nconditional, leaving a codepath where it is used uninitialized via\\nkvm_pgtable_stage2_map().\\n\\nThis can fail on any path that requires a stage-2 allocation\\nwithout transition via a permission fault or dirty logging.\\n\\nFix this by making sure that memcache is always valid.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: Correcci\u00f3n de un puntero de memcache no inicializado en user_mem_abort(). El commit fce886a60207 (\\\"KVM: arm64: Conectar la MMU pKVM en KVM\\\") hizo que la inicializaci\u00f3n de la variable de memcache local en user_mem_abort() fuera condicional, dejando la ruta de c\u00f3digo donde se usa sin inicializar mediante kvm_pgtable_stage2_map(). Esto puede fallar en cualquier ruta que requiera una asignaci\u00f3n de etapa 2 sin transici\u00f3n debido a un fallo de permiso o un registro incorrecto. Para solucionar esto, aseg\u00farese de que la memcache sea siempre v\u00e1lida.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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