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CVE-2022-49883

Estado: ModificadaAlta (7.1)—

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

KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format

On 64 bit host, if the guest doesn't have X86_FEATURE_LM, KVM will access 16 gprs to 32-bit smram image, causing out-ouf-bound ram access.

On 32 bit host, the rsm_load_state_64/enter_smm_save_state_64 is compiled out, thus access overflow can't happen.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:L/PR:L sin UI permite escalada local. Acceso OOB a SMRAM en modo SMM puede ejecutar código o causar DoS; confianza moderada por falta de detalles de explotación.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2022-49883",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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              "status": "unaffected",
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  "published": "2025-05-01T15:16:13.287",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/696db303e54f7352623d9f640e6c51d8fa9d5588",
      "tags": [
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      "description": [
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          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: smm: number of GPRs in the SMRAM image depends on the image format\n\nOn 64 bit host, if the guest doesn't have X86_FEATURE_LM, KVM will\naccess 16 gprs to 32-bit smram image, causing out-ouf-bound ram\naccess.\n\nOn 32 bit host, the rsm_load_state_64/enter_smm_save_state_64\nis compiled out, thus access overflow can't happen."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86: smm: el número de GPR en la imagen SMRAM depende del formato de la imagen. En un host de 64 bits, si el invitado no tiene X86_FEATURE_LM, KVM accederá a 16 GPRS en la imagen SMRAM de 32 bits, lo que provocará un acceso a la RAM fuera de los límites. En un host de 32 bits, rsm_load_state_64/enter_smm_save_state_64 se compila, por lo que no se puede producir un desbordamiento de acceso."
    }
  ],
  "lastModified": "2026-08-04T10:17:57.967",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
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