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CVE-2021-4207

Estado: ModificadaAlta (8.2)—

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

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 (3)

Debian — Debian LinuxQemu — QemuRedhat — Enterprise Linux

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-4207",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
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          "userInteraction": "NONE",
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          "vendor": "n/a",
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  "published": "2022-04-29T17:15:20.100",
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  "vulnStatus": "Modified",
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      "source": "secalert@redhat.com",
      "description": [
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          "value": "CWE-362"
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      "lang": "en",
      "value": "A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process."
    },
    {
      "lang": "es",
      "value": "Se ha encontrado un fallo en la emulación del dispositivo de visualización QXL en QEMU. Una doble obtención de los valores controlados por el huésped \"cursor-)header.width\" y \"cursor-)header.height\" puede conllevar a una asignación de un pequeño objeto cursor seguido de un posterior desbordamiento del búfer en la región heap de la memoria. Un usuario invitado con privilegios maliciosos podría usar este fallo para bloquear el proceso de QEMU en el host o ejecutar potencialmente código arbitrario dentro del contexto del proceso de QEMU"
    }
  ],
  "lastModified": "2026-06-17T04:19:13.133",
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