CVE-2026-10671

{
  "id": "CVE-2026-10671",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-14T15:16:55.447",
  "lastModified": "2026-10-24T21:10:00.130",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Zephyr's kernel pipe implementation, the userspace syscall verifier z_vrfy_k_pipe_init() in kernel/pipe.c used K_SYSCALL_OBJ() (which requires the kernel object to already be initialized) instead of K_SYSCALL_OBJ_NEVER_INIT() (which rejects an already-initialized object). As a result, on CONFIG_USERSPACE builds an unprivileged user thread that has been granted access to a k_pipe object can invoke the k_pipe_init syscall to re-initialize a pipe that is already in use.\n\nz_impl_k_pipe_init() unconditionally resets the ring buffer, sets pipe->waiting to 0, and re-initializes both wait queues (z_waitq_init on pipe->data and pipe->space) without waking or accounting for threads currently blocked on the pipe. Any thread already pended in k_pipe_read()/k_pipe_write() is left orphaned: still marked pending with pended_on pointing at the cleared wait queue and with stale qnode_dlist links into the (now re-initialized) embedded list head.\n\nWhen such an orphaned waiter is later timed out or woken, the scheduler calls sys_dlist_remove() on its stale node, writing through dangling prev/next pointers into kernel wait-queue/scheduler structures, causing list corruption (an attacker-driven invalid kernel write), lost wakeups, indefinitely blocked threads, and silent data loss. The flaw lets a deprivileged user thread corrupt the state of a kernel object shared with other threads/partitions.\n\nThe fix switches the verifier to K_SYSCALL_OBJ_NEVER_INIT(), matching the existing k_msgq_init verifier, so a user thread can no longer re-initialize a live pipe. The vulnerable code shipped in v4.1.0 and remained through v4.4.0."
    },
    {
      "lang": "es",
      "value": "En la implementación de tuberías del kernel de Zephyr, el verificador de llamadas al sistema de espacio de usuario z_vrfy_k_pipe_init() en kernel/pipe.c usó K_SYSCALL_OBJ() (que requiere que el objeto del kernel ya esté inicializado) en lugar de K_SYSCALL_OBJ_NEVER_INIT() (que rechaza un objeto ya inicializado). Como resultado, en las compilaciones CONFIG_USERSPACE, un hilo de usuario sin privilegios al que se le ha concedido acceso a un objeto k_pipe puede invocar la llamada al sistema k_pipe_init para reinicializar una tubería que ya está en uso.\n\nz_impl_k_pipe_init() reinicia incondicionalmente el búfer circular, establece pipe  ->  waiting en 0 y reinicializa ambas colas de espera (z_waitq_init en pipe  ->  data y pipe  ->  space) sin despertar o tener en cuenta los hilos actualmente bloqueados en la tubería. Cualquier hilo ya pendiente en k_pipe_read()/k_pipe_write() queda huérfano: todavía marcado como pendiente con pended_on apuntando a la cola de espera borrada y con enlaces qnode_dlist obsoletos en el encabezado de lista incrustado (ahora reinicializado).\n\nCuando dicho esperador huérfano expira o es despertado más tarde, el planificador llama a sys_dlist_remove() en su nodo obsoleto, escribiendo a través de punteros prev/next colgantes en estructuras de cola de espera/planificador del kernel, causando corrupción de la lista (una escritura inválida del kernel impulsada por un atacante), pérdidas de activación, hilos bloqueados indefinidamente y pérdida silenciosa de datos. La falla permite que un hilo de usuario desprivilegiado corrompa el estado de un objeto del kernel compartido con otros hilos/particiones.\n\nLa solución cambia el verificador a K_SYSCALL_OBJ_NEVER_INIT(), coincidiendo con el verificador k_msgq_init existente, por lo que un hilo de usuario ya no puede reinicializar una tubería activa. El código vulnerable se envió en v4.1.0 y permaneció hasta v4.4.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zephyrproject",
          "product": "zephyr",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
          "packageName": "zephyr",
          "programFiles": [
            "kernel/pipe.c"
          ],
          "versions": [
            {
              "version": "4.1.0",
              "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:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-14T15:29:11.440113Z",
          "id": "CVE-2026-10671",
          "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-825"
        }
      ]
    },
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.1.0",
              "versionEndExcluding": "4.5.0",
              "matchCriteriaId": "126A079E-DBC1-4B1D-AE33-D21D14520336"
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  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/4424aa681e0b80e9cbd0ae27a987d582be88cb74",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p8w8-3x99-mg8f",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}