FKIE_CVE-2025-37996

Vulnerability from fkie_nvd - Published: 2025-05-29 14:15 - Updated: 2025-11-14 16:58
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.15
linux linux_kernel 6.15
linux linux_kernel 6.15
linux linux_kernel 6.15
linux linux_kernel 6.15
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  "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."
    }
  ],
  "id": "CVE-2025-37996",
  "lastModified": "2025-11-14T16:58:42.223",
  "metrics": {
    "cvssMetricV31": [
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2025-05-29T14:15:36.183",
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  "vulnStatus": "Analyzed",
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      "source": "nvd@nist.gov",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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