CVE-2026-10640

{
  "id": "CVE-2026-10640",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-16T15:16:34.317",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Zephyr's IPv6 Neighbor Discovery send paths (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs in subsys/net/ip/ipv6_nbr.c) updated the per-interface ICMP-sent statistics by calling net_pkt_iface(pkt) after net_send_data(pkt) had already returned successfully. On the success path the network stack owns and releases the packet's reference (the L2/driver send unrefs it, e.g. ethernet_send -> net_pkt_unref), so for a freshly allocated packet with refcount 1 the net_pkt slab block can be freed before the statistics line runs (synchronously when no TX queue thread is configured, or via a concurrent TX thread otherwise).\n\nThe subsequent net_pkt_iface(pkt) reads pkt->iface from the freed slab block, and with CONFIG_NET_STATISTICS_PER_INTERFACE enabled that loaded pointer is dereferenced to increment iface->stats.icmp.sent, a use-after-free (CWE-416). If the slab block was reallocated in the meantime the read/increment targets unrelated or attacker-influenced memory, yielding corrupted statistics, a fault/crash (denial of service), or potential limited memory corruption.\n\nThe vulnerable Neighbor Advertisement path is reachable by any unauthenticated on-link node simply by sending ICMPv6 Neighbor Solicitations to a Zephyr node with native IPv6 enabled (handle_ns_input -> net_ipv6_send_na).\n\nAffected from v3.3.0 through v4.4.0; the fix uses the already-available iface argument instead of touching the sent packet. Configurations without per-interface statistics dereference only a global counter and are not affected by the memory-safety aspect."
    },
    {
      "lang": "es",
      "value": "Las rutas de envío de Neighbor Discovery IPv6 de Zephyr (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs en subsys/net/ip/ipv6_nbr.c) actualizaban las estadísticas de ICMP enviado por interfaz llamando a net_pkt_iface(pkt) después de que net_send_data(pkt) ya había retornado exitosamente. En la ruta de éxito, la pila de red posee y libera la referencia del paquete (el envío del L2/controlador la desreferencia, p. ej., ethernet_send - net_pkt_unref), así, para un paquete recién asignado con refcount 1, el bloque slab de net_pkt puede ser liberado antes de que se ejecute la línea de estadísticas (sincrónicamente cuando no hay un hilo de cola TX configurado, o a través de un hilo TX concurrente de lo contrario).\n\nLa subsiguiente net_pkt_iface(pkt) lee pkt-iface del bloque slab liberado, y con CONFIG_NET_STATISTICS_PER_INTERFACE habilitado, ese puntero cargado es desreferenciado para incrementar iface-stats.icmp.sent, un uso después de liberación (CWE-416). Si el bloque slab fue reasignado mientras tanto, la lectura/incremento apunta a memoria no relacionada o influenciada por el atacante, resultando en estadísticas corruptas, una falla/caída (denegación de servicio), o potencial corrupción de memoria limitada.\n\nLa ruta vulnerable de Neighbor Advertisement es alcanzable por cualquier nodo en el enlace no autenticado simplemente enviando Solicitudes de Vecino ICMPv6 a un nodo Zephyr con IPv6 nativo habilitado (handle_ns_input - net_ipv6_send_na).\n\nAfectado desde v3.3.0 hasta v4.4.0; la corrección utiliza el argumento iface ya disponible en lugar de tocar el paquete enviado. Las configuraciones sin estadísticas por interfaz desreferencian solo un contador global y no se ven afectadas por el aspecto de seguridad de la memoria."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zephyrproject",
          "product": "zephyr",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
          "packageName": "zephyr",
          "programFiles": [
            "subsys/net/ip/ipv6_nbr.c"
          ],
          "versions": [
            {
              "version": "3.3.0",
              "lessThan": "4.3.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "4.4.0",
              "lessThan": "4.4.1",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
          "baseScore": 4.2,
          "baseSeverity": "MEDIUM",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 2.5
      },
      {
        "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:L/A:H",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-16T15:28:30.797017Z",
          "id": "CVE-2026-10640",
          "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-416"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "3.3.0",
              "versionEndExcluding": "4.5.0",
              "matchCriteriaId": "7032D8BD-EADE-46BD-861F-2397CC9081BB"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/aaed8332a62b0490a2f3c2cbabe272f575068eaa",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-r74c-mr4m-7g9g",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}