{"id":"CVE-2026-10674","revision":"29830c47f6e041d880299a7ce10232a1","records":[{"revision":"29830c47f6e041d880299a7ce10232a1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-10674","aliases":[],"title":"DoS (hard fault) in NXP LPUART driver: unsupported runtime UART config leaves clocks disabled","description":"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.","state":0,"publishedAt":"2026-07-21T21:30:53.643+00:00","modifiedAt":"2026-10-15T22:10:16.575+00:00","affected":[{"ecosystem":"https://github.com/zephyrproject-rtos/zephyr","name":"zephyr","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com/zephyrproject-rtos/zephyr\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageName\": \"zephyr\",\n                    \"product\": \"zephyr\",\n                    \"programFiles\": [\n                        \"drivers/serial/uart_mcux_lpuart.c\"\n                    ],\n                    \"vendor\": \"zephyrproject\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"4.3.1\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.7.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThan\": \"4.4.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"4.4.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5,"severity":"MEDIUM"}],"references":["https://github.com/zephyrproject-rtos/zephyr/commit/f56935c46fdf6559a20ad8484b29896ecac5808f","https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-mw68-r353-m3vf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-10674","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-10674","identifiers":["CVE-2026-10674"]},"retained":false,"historicalAffected":[]}],"coverage":[]}