CVE-2026-9728
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk0th percentile - higher than 0% of all known CVEs
Summary
Vulnerability in the userspace syscall verifier z_vrfy_mbox_send() in the mbox driver allows unprivileged threads to bypass access controls and read kernel memory or cause a denial of service via a time-of-check/time-of-use race.
Risk Assessment
An attacker could access sensitive kernel data or cause a system crash, posing a serious threat to confidentiality and availability.
Recommendation
Apply the fix that snapshots the entire mbox_msg structure into kernel memory before validation, and update the system.
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Original NVD description (English source)
The userspace syscall verifier z_vrfy_mbox_send() in drivers/mbox/mbox_handlers.c validated the nested msg->data/msg->size fields by reading them directly out of live userspace memory, and then forwarded the original, still-mutable userspace struct mbox_msg * pointer to z_impl_mbox_send() and the underlying driver. Between the access check and the driver's use of msg->data, the validated pointer could be replaced, leaving a time-of-check/time-of-use window. On a system built with CONFIG_USERSPACE, any unprivileged userspace thread may invoke the mbox_send() system call. A second thread sharing the caller's address space can race to overwrite msg->data with a supervisor (kernel) address after the verifier's bounds check has passed but before the driver dereferences it. The driver then reads from the attacker-chosen address in supervisor context (for example memcpy(&data32, msg->data, msg->size) in the NXP mailbox driver, whose bytes are subsequently emitted to the peer mailbox endpoint). The impact is a userspace-to-supervisor access-control bypass: disclosure of kernel memory contents (high confidentiality impact), or, for an invalid/unmapped target address, a faulting kernel read causing denial of service. The fix snapshots the entire struct mbox_msg into a kernel-stack copy with k_usermode_from_copy() and validates and forwards that immutable copy, closing the race.