CVE-2026-10658

{
  "id": "CVE-2026-10658",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-23T01:16:26.867",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "bt_iso_recv() in subsys/bluetooth/host/iso.c pulled the ISO SDU header (4 bytes) or, when the timestamp flag is set, the timestamped SDU header (8 bytes) from the inbound HCI ISO Data buffer via net_buf_pull_mem() without first checking buf->len. The upstream hci_iso() handler enforces buf->len == the controller-declared ISO Data_Load length, so a malicious or buggy controller / adjacent BLE peer on an established CIS/BIS can present a first-fragment (BT_ISO_START) or single (BT_ISO_SINGLE) PDU shorter than the SDU header. Because net_buf_simple_pull_mem only guards length with __ASSERT_NO_MSG (compiled out when CONFIG_ASSERT is disabled, the production default), the pull underflows buf->len (uint16_t, e.g. 0 - 8 = 0xFFF8) and advances buf->data past valid data: the subsequent reads of hdr->slen and hdr->sn are out-of-bounds reads of adjacent pool memory. For the multi-fragment (START) case the corrupted buffer is retained as iso->rx, and a following CONT/END fragment's net_buf_tailroom() guard underflows to a near-SIZE_MAX value, defeating the bounds check and causing net_buf_add_mem() to memcpy attacker-supplied fragment data far past the RX pool buffer (out-of-bounds write). The flaw affects ISO receive builds (CONFIG_BT_ISO_RX, selected by the default-off LE Audio options BT_ISO_PERIPHERAL/BT_ISO_CENTRAL/BT_ISO_SYNC_RECEIVER) and has existed since the ISO subsystem was introduced (v2.6.0) through v4.4.0. The fix adds explicit buf->len < sizeof(ts_hdr) and buf->len < sizeof(hdr) checks that drop the buffer before pulling."
    },
    {
      "lang": "es",
      "value": "Una validación de longitud faltante en la ruta de recepción ISO del Host Bluetooth de Zephyr puede ser activada por datos ISO HCI malformados. En bt_iso_recv() (subsys/bluetooth/host/iso.c), al procesar fragmentos PB=START/SINGLE, el código extrae una cabecera SDU TS (8 bytes, ts=1) o una cabecera SDU no TS (4 bytes, ts=0) sin verificar primero que buf  ->  len contenga al menos esa cantidad de bytes. La verificación de longitud ISO HCI externa en hci_iso() valida la consistencia de la longitud de la carga útil, pero no el tamaño mínimo de la cabecera SDU interna, por lo que un paquete con longitud de carga útil 1 pasa hci_iso() y luego llega a net_buf_pull_mem(), que afirma buf  ->  len >= len. Como resultado, el tráfico ISO malformado activa de forma determinista una aserción del kernel (denegación de servicio) en compilaciones con aserciones habilitadas, y en compilaciones sin aserciones la misma ruta puede continuar con un búfer de tamaño insuficiente, lo que lleva a un comportamiento de lectura fuera de límites. El problema afecta a productos que utilizan el Host de Zephyr con CONFIG_BT_ISO_RX habilitado, particularmente donde los datos HCI entrantes pueden ser influenciados por un controlador malicioso o comprometido o tráfico ISO reenviado malformado."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zephyrproject",
          "product": "zephyr",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
          "packageName": "zephyr",
          "programFiles": [
            "subsys/bluetooth/host/iso.c"
          ],
          "versions": [
            {
              "version": "2.6.0",
              "lessThan": "4.3.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "4.4.0",
              "lessThan": "4.4.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-23T12:20:39.798180Z",
          "id": "CVE-2026-10658",
          "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"
        }
      ]
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionEndIncluding": "4.4.1",
              "matchCriteriaId": "9A947003-969D-455C-8C9D-6AF56EDB9330"
            }
          ]
        }
      ]
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  ],
  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/756b16b64317defefad36fc994316cf96e418708",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-26g8-rmpf-j6cw",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}