CVE-2026-10671

{"id": "CVE-2026-10671", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10671", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-14T15:29:11.440113Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "vulnerabilities@zephyrproject.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "affected": [{"source": "vulnerabilities@zephyrproject.org", "affectedData": [{"vendor": "zephyrproject", "product": "zephyr", "versions": [{"status": "affected", "version": "4.1.0", "lessThan": "4.3.1", "versionType": "semver"}, {"status": "affected", "version": "4.4.0", "lessThan": "4.4.2", "versionType": "semver"}], "packageName": "zephyr", "programFiles": ["kernel/pipe.c"], "collectionURL": "https://github.com/zephyrproject-rtos/zephyr", "defaultStatus": "unaffected"}]}], "published": "2026-07-14T15:16:55.447", "references": [{"url": "https://github.com/zephyrproject-rtos/zephyr/commit/4424aa681e0b80e9cbd0ae27a987d582be88cb74", "tags": ["Patch"], "source": "vulnerabilities@zephyrproject.org"}, {"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p8w8-3x99-mg8f", "tags": ["Exploit", "Patch", "Vendor Advisory"], "source": "vulnerabilities@zephyrproject.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "vulnerabilities@zephyrproject.org", "description": [{"lang": "en", "value": "CWE-825"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-1188"}]}], "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 implementaci\u00f3n de tuber\u00edas del kernel de Zephyr, el verificador de llamadas al sistema de espacio de usuario z_vrfy_k_pipe_init() en kernel/pipe.c us\u00f3 K_SYSCALL_OBJ() (que requiere que el objeto del kernel ya est\u00e9 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 tuber\u00eda que ya est\u00e1 en uso.\n\nz_impl_k_pipe_init() reinicia incondicionalmente el b\u00fafer 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 tuber\u00eda. Cualquier hilo ya pendiente en k_pipe_read()/k_pipe_write() queda hu\u00e9rfano: todav\u00eda 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 hu\u00e9rfano expira o es despertado m\u00e1s tarde, el planificador llama a sys_dlist_remove() en su nodo obsoleto, escribiendo a trav\u00e9s de punteros prev/next colgantes en estructuras de cola de espera/planificador del kernel, causando corrupci\u00f3n de la lista (una escritura inv\u00e1lida del kernel impulsada por un atacante), p\u00e9rdidas de activaci\u00f3n, hilos bloqueados indefinidamente y p\u00e9rdida 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 soluci\u00f3n 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 tuber\u00eda activa. El c\u00f3digo vulnerable se envi\u00f3 en v4.1.0 y permaneci\u00f3 hasta v4.4.0."}], "lastModified": "2026-10-24T21:10:00.130", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "126A079E-DBC1-4B1D-AE33-D21D14520336", "versionEndExcluding": "4.5.0", "versionStartIncluding": "4.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "vulnerabilities@zephyrproject.org"}