Zephyr Project up to 4.4.x LPUART driver uart_mcux_lpuart.c uart_configure cfg denial of service

Summaryinfo

A vulnerability categorized as critical has been discovered in Zephyr Project Zephyr up to 4.4.x. The impacted element is the function uart_configure of the file drivers/serial/uart_mcux_lpuart.c of the component LPUART driver. The manipulation of the argument cfg results in denial of service. This vulnerability is reported as CVE-2026-10674. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability was found in Zephyr Project Zephyr up to 4.4.x. It has been classified as critical. Affected is the function uart_configure of the file drivers/serial/uart_mcux_lpuart.c of the component LPUART driver. The manipulation of the argument cfg with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

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. As 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. uart_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. Introduced 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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-10674 since 06/02/2026. The exploitability is told to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 4.5.0 eliminates this vulnerability. Applying the patch f56935c46fdf6559a20ad8484b29896ecac5808f is able to eliminate this problem.

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Productinfo

Type

• Project Management Software

Vendor

• Zephyr Project

Name

• Zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4

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CPE 2.2info

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