CVE-2026-40257

{
  "id": "CVE-2026-40257",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-06T17:16:31.253",
  "lastModified": "2026-10-25T20:10:00.147",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.21.0 and prior to version 4.11.0, the ARM Crypto Extensions accelerated SHA-3 implementation has an off-by-one error that can cause a massive heap overflow that corrupts all TEE kernel memory following the hash state. This affects all platforms built with `CFG_CRYPTO_WITH_CE82=y` (ARMv8.2+ with SHA3 Crypto Extensions). Version 4.11.0 contains a patch. As a workaround, disable SHA3 Crypto Extensions with `CFG_CRYPTO_WITH_CE82=n`."
    },
    {
      "lang": "es",
      "value": "OP-TEE es un Entorno de Ejecución Confiable (TEE) diseñado como compañero de un kernel de Linux no seguro ejecutándose en Arm; núcleos Cortex-A usando la tecnología TrustZone. A partir de la versión 3.21.0 y antes de la versión 4.11.0, la implementación SHA-3 acelerada por las Extensiones Criptográficas de ARM tiene un error de ’off-by-one’ que puede causar un desbordamiento de montículo masivo que corrompe toda la memoria del kernel del TEE después del estado del hash. Esto afecta a todas las plataformas construidas con ’CFG_CRYPTO_WITH_CE82=y’ (ARMv8.2+ con Extensiones Criptográficas SHA3). La versión 4.11.0 contiene un parche. Como solución alternativa, deshabilite las Extensiones Criptográficas SHA3 con ’CFG_CRYPTO_WITH_CE82=n’."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "OP-TEE",
          "product": "optee_os",
          "versions": [
            {
              "version": ">= 3.21.0, < 4.11.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-06T18:57:28.891502Z",
          "id": "CVE-2026-40257",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "3.21.0",
              "versionEndIncluding": "4.10.0",
              "matchCriteriaId": "C9D819B8-1780-4240-BF51-0FC2FF483CCD"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-75x4-j8p9-55qv",
      "source": "[email protected]",
      "tags": [
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}