CVE-2026-6458

{
  "id": "CVE-2026-6458",
  "sourceIdentifier": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
  "published": "2026-06-24T00:16:34.037",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing the final tag to exclude the first batch of processed ciphertext. Ciphertext produced by that call may be modified without the tag reflecting the change.\n\nThis issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0."
    },
    {
      "lang": "es",
      "value": "Un paso criptográfico faltante en el firmware Caliptra Core (módulo aes_256_gcm_update) resulta en una etiqueta de autenticación GCM incorrecta. Cuando se utiliza la API de streaming AES-256-GCM con AAD vacío, el estado del acumulador GHASH del hardware no se guarda después de la primera llamada de actualización, lo que hace que la etiqueta final excluya el primer lote de texto cifrado procesado. El texto cifrado producido por esa llamada puede ser modificado sin que la etiqueta refleje el cambio.\n\nEste problema afecta al firmware Core Runtime: desde 2.0.0 hasta 2.0.1, 2.1.0."
    }
  ],
  "affected": [
    {
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
      "affectedData": [
        {
          "vendor": "Caliptra",
          "product": "Core Runtime Firmware",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/chipsalliance/caliptra-sw",
          "packageName": "Core Runtime Firmware",
          "modules": [
            "aes_256_gcm_update"
          ],
          "versions": [
            {
              "version": "2.0.0",
              "lessThanOrEqual": "2.0.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.1.0",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.0.2",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "2.1.1",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 5.1,
          "baseSeverity": "MEDIUM",
          "attackVector": "ADJACENT",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-24T13:14:19.562293Z",
          "id": "CVE-2026-6458",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-325"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-834g-h5x6-2hqr",
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554"
    }
  ]
}