CVE-2026-10774

{
  "id": "CVE-2026-10774",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-02T15:16:33.793",
  "lastModified": "2026-10-23T22:10:00.160",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Zephyr's Bluetooth Mesh subnet key management leaks one PSA Crypto key slot on every subnet-key teardown. In subsys/bluetooth/mesh/subnet.c, net_keys_create() imports the Private Beacon Key into a PSA key slot under CONFIG_BT_MESH_PRIV_BEACONS (enabled by default), but subnet_keys_destroy() guarded the matching psa_destroy_key() with CONFIG_BT_MESH_V1d1. That Kconfig symbol was removed when explicit Mesh 1.0.1 support was dropped, so the destroy branch became permanently dead code and the import is never balanced by a destroy.\n\nThe imbalanced teardown is reached every time subnet keys are destroyed: deleting a subnet (Config Server NetKey Delete), completing a Key Refresh Procedure (which retires the old key set), and resetting/re-provisioning the node. The over-the-air triggers are processed only under the node's device key, so they are exercisable by the provisioner or network administrator that owns the node, reachable over the Bluetooth Mesh network.\n\nWith the default CONFIG_MBEDTLS_PSA_KEY_SLOT_COUNT of 16, repeated add/delete or key-refresh cycles exhaust the shared PSA key-slot pool after roughly a dozen rounds. Once exhausted, bt_mesh_private_beacon_key() and thus subnet creation fail: the node can no longer add subnets or complete key refresh, and other PSA crypto consumers on the device may be starved, until the device is rebooted. The fix aligns the destroy guard with the import guard (CONFIG_BT_MESH_PRIV_BEACONS) so each slot is freed."
    },
    {
      "lang": "es",
      "value": "La gestión de claves de subred de Bluetooth Mesh de Zephyr provoca una fuga de una ranura de clave PSA Crypto en cada eliminación de clave de subred. En subsys/bluetooth/mesh/subnet.c, net_keys_create() importa la Clave de Baliza Privada en una ranura de clave PSA bajo CONFIG_BT_MESH_PRIV_BEACONS (habilitado por defecto), pero subnet_keys_destroy() protegía la función psa_destroy_key() correspondiente con CONFIG_BT_MESH_V1d1. Ese símbolo de Kconfig fue eliminado cuando se abandonó el soporte explícito para Mesh 1.0.1, por lo que la rama de destrucción se convirtió permanentemente en código muerto y la importación nunca es equilibrada por una destrucción.\n\nEl desmantelamiento desequilibrado se alcanza cada vez que se destruyen las claves de subred: al eliminar una subred (Eliminación de NetKey del Servidor de Configuración), al completar un Procedimiento de Actualización de Claves (que retira el conjunto de claves antiguo) y al reiniciar/reaprovisionar el nodo. Los disparadores inalámbricos se procesan solo bajo la clave de dispositivo del nodo, por lo que pueden ser ejercidos por el aprovisionador o el administrador de red que posee el nodo, accesibles a través de la red Bluetooth Mesh.\n\nCon el valor predeterminado de CONFIG_MBEDTLS_PSA_KEY_SLOT_COUNT de 16, los ciclos repetidos de añadir/eliminar o de actualización de claves agotan el grupo compartido de ranuras de clave PSA después de aproximadamente una docena de rondas. Una vez agotado, bt_mesh_private_beacon_key() y, por lo tanto, la creación de subredes fallan: el nodo ya no puede añadir subredes ni completar la actualización de claves, y otros consumidores de criptografía PSA en el dispositivo pueden verse privados de recursos, hasta que se reinicie el dispositivo. La solución alinea la protección de destrucción con la protección de importación (CONFIG_BT_MESH_PRIV_BEACONS) para que cada ranura sea liberada."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zephyrproject",
          "product": "zephyr",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
          "packageName": "zephyr",
          "programFiles": [
            "subsys/bluetooth/mesh/subnet.c"
          ],
          "versions": [
            {
              "version": "3.6.0",
              "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:H/UI:N/S:U/C:N/I:N/A:L",
          "baseScore": 2.4,
          "baseSeverity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 0.9,
        "impactScore": 1.4
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-03T14:56:50.806041Z",
          "id": "CVE-2026-10774",
          "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-401"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "3.6.0",
              "versionEndExcluding": "4.5.0",
              "matchCriteriaId": "DD732473-E0F3-4E27-AD8B-983D7D9C10D6"
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  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/f573da9f53630082ae95fcfd39fb021fe15f7abd",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6q7g-798f-76p2",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}