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CVE-2021-29256

Estado: AnalizadaAlta (8.8)⚠ Explotación activa

. The Arm Mali GPU kernel driver allows an unprivileged user to achieve access to freed memory, leading to information disclosure or root privilege escalation. This affects Bifrost r16p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r28p0 through r30p0.

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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

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

Vulnerabilidad de use-after-free (CWE-416) en driver GPU kernel accesible remotamente sin privilegios (AV:N, PR:L). Permite escalada a root y lectura de memoria, típico de explotación de servicios kernel para ejecución remota.

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

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationExecution PreventionDisable or Remove Feature or Program

Tecnologías afectadas (3)

ARM — Bifrost GPU Kernel DriverARM — Midgard GPU Kernel DriverARM — Valhall GPU Kernel Driver

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-29256",
  "cveTags": [],
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          "options": [
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          "version": "2.0.3",
          "timestamp": "2025-02-04T19:43:25.118908Z"
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          "availabilityImpact": "COMPLETE",
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        "obtainAllPrivilege": false,
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        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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    "cvssMetricV31": [
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        "type": "Primary",
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        "cvssData": {
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  "published": "2021-05-24T18:15:08.033",
  "references": [
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      "url": "https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver",
      "tags": [
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      ],
      "source": "cve@mitre.org"
    },
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    },
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      "tags": [
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      ],
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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    {
      "type": "Secondary",
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      "description": [
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  "descriptions": [
    {
      "lang": "en",
      "value": ". The Arm Mali GPU kernel driver allows an unprivileged user to achieve access to freed memory, leading to information disclosure or root privilege escalation. This affects Bifrost r16p0 through r29p0 before r30p0, Valhall r19p0 through r29p0 before r30p0, and Midgard r28p0 through r30p0."
    },
    {
      "lang": "es",
      "value": "El controlador del kernel de la GPU Arm Mali, permite a un usuario no privilegiado acceder a la memoria liberada, conllevando a una divulgación de información o una escalada de privilegios de root. Esto afecta a Bifrost versiones r16p0 hasta r29p0 anteriores a r30p0, Valhall r19p0 hasta r29p0 anteriores a r30p0 y Midgard versiones r28p0 hasta r30p0"
    }
  ],
  "lastModified": "2026-06-17T03:47:27.647",
  "cisaActionDue": "2023-07-28",
  "cisaExploitAdd": "2023-07-07",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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              "versionEndExcluding": "r30p0",
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            },
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org",
  "cisaRequiredAction": "Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.",
  "cisaVulnerabilityName": "Arm Mali GPU Kernel Driver Use-After-Free Vulnerability"
}