CVE-2026-10674

{"id": "CVE-2026-10674", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10674", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-22T19:32:08.144813Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "vulnerabilities@zephyrproject.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "vulnerabilities@zephyrproject.org", "affectedData": [{"vendor": "zephyrproject", "product": "zephyr", "versions": [{"status": "affected", "version": "3.7.0", "lessThan": "4.3.1", "versionType": "semver"}, {"status": "affected", "version": "4.4.0", "lessThan": "4.4.2", "versionType": "semver"}], "packageName": "zephyr", "programFiles": ["drivers/serial/uart_mcux_lpuart.c"], "collectionURL": "https://github.com/zephyrproject-rtos/zephyr", "defaultStatus": "unaffected"}]}], "published": "2026-07-21T22:16:58.740", "references": [{"url": "https://github.com/zephyrproject-rtos/zephyr/commit/f56935c46fdf6559a20ad8484b29896ecac5808f", "tags": ["Patch"], "source": "vulnerabilities@zephyrproject.org"}, {"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-mw68-r353-m3vf", "tags": ["Patch", "Vendor Advisory"], "source": "vulnerabilities@zephyrproject.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "vulnerabilities@zephyrproject.org", "description": [{"lang": "en", "value": "CWE-617"}]}], "descriptions": [{"lang": "en", "value": "The NXP LPUART serial driver (drivers/serial/uart_mcux_lpuart.c), when CONFIG_UART_USE_RUNTIME_CONFIGURE is enabled, called LPUART_Deinit() at the start of mcux_lpuart_configure(), which disables the LPUART peripheral clocks. The requested configuration is validated only afterwards (in mcux_lpuart_configure_basic), and unsupported parity/data-bit/stop-bit/flow-control values return -ENOTSUP before the clock is re-enabled.\n\nAs a result, a uart_configure() request with an unsupported configuration left the LPUART in a clock-disabled state; any subsequent access to LPUART registers (poll_out/poll_in, interrupt handling, or a later reconfigure) faults on the gated peripheral and escalates to a hard fault, crashing the system.\n\nuart_configure() is a Zephyr syscall whose verifier (z_vrfy_uart_configure) only checks that cfg is readable user memory and forwards the caller-supplied configuration unchanged, so an unprivileged userspace thread with access to an LPUART device can deterministically trigger the fault, a persistent system-wide denial of service.\n\nIntroduced in v2.5.0 and present in all subsequent releases until this fix, which removes the LPUART_Deinit() call and instead only disables the transmitter/receiver, leaving the clock running."}, {"lang": "es", "value": "El controlador serie NXP LPUART (drivers/serial/uart_mcux_lpuart.c), cuando CONFIG_UART_USE_RUNTIME_CONFIGURE est\u00e1 habilitado, llamaba a LPUART_Deinit() al inicio de mcux_lpuart_configure(), lo que deshabilita los relojes perif\u00e9ricos LPUART. La configuraci\u00f3n solicitada se valida solo despu\u00e9s (en mcux_lpuart_configure_basic), y los valores no admitidos de paridad/bits de datos/bits de parada/control de flujo devuelven -ENOTSUP antes de que el reloj se vuelva a habilitar.\n\nComo resultado, una solicitud de uart_configure() con una configuraci\u00f3n no admitida dejaba el LPUART en un estado con el reloj deshabilitado; cualquier acceso posterior a los registros LPUART (poll_out/poll_in, manejo de interrupciones o una reconfiguraci\u00f3n posterior) falla en el perif\u00e9rico bloqueado y escala a un fallo grave, bloqueando el sistema.\n\nuart_configure() es una llamada al sistema (syscall) de Zephyr cuyo verificador (z_vrfy_uart_configure) solo verifica que cfg es memoria de usuario legible y reenv\u00eda la configuraci\u00f3n proporcionada por el llamador sin cambios, por lo que un hilo de espacio de usuario sin privilegios con acceso a un dispositivo LPUART puede desencadenar la falla de forma determinista, una denegaci\u00f3n de servicio persistente a nivel de todo el sistema.\n\nIntroducido en la v2.5.0 y presente en todas las versiones posteriores hasta esta correcci\u00f3n, que elimina la llamada a LPUART_Deinit() y en su lugar solo deshabilita el transmisor/receptor, dejando el reloj en funcionamiento."}], "lastModified": "2026-10-24T19:10:00.127", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E03F3A48-9F88-412D-B4A0-2156F391EA7B", "versionEndIncluding": "4.4.1", "versionStartIncluding": "2.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "vulnerabilities@zephyrproject.org"}