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CVE-2025-37996

Estado: ModificadaMedia (5.5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "value": "CWE-908"
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      "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."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: Corrección 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 inicialización de la variable de memcache local en user_mem_abort() fuera condicional, dejando la ruta de código donde se usa sin inicializar mediante kvm_pgtable_stage2_map(). Esto puede fallar en cualquier ruta que requiera una asignación de etapa 2 sin transición debido a un fallo de permiso o un registro incorrecto. Para solucionar esto, asegúrese de que la memcache sea siempre válida."
    }
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  "lastModified": "2026-07-30T06:22:42.973",
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