CVE-2026-17053
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk0th percentile - higher than 0% of all known CVEs
Summary
Two Zephyr syscalls (smbus_smbalert_remove_cb() and smbus_host_notify_remove_cb()) forwarded a caller-supplied struct smbus_callback *cb pointer into kernel-mode driver code without any memory validation. On builds with CONFIG_USERSPACE and an SMBus driver supporting SMBALERT or Host Notify, a user-mode thread could unregister a callback registered by a supervisor-mode component or trigger a kernel fault via a bogus pointer. The fix removes both syscall entry points.
Risk Assessment
An unprivileged thread can silently disable SMBALERT or Host Notify handling for the rest of the system, and with CONFIG_ASSERT=y cause a fatal kernel-mode fault that discloses which addresses are mapped. Only builds with CONFIG_USERSPACE and an SMBus driver with SMBALERT or Host Notify support are affected.
Recommendation
Update Zephyr to a version containing the fix that removes both syscall entry points and demotes the functions to ordinary static inline calls. If updating is not possible, disable CONFIG_USERSPACE or the SMBus driver with SMBALERT/Host Notify support.
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Original NVD description (English source)
The SMBus driver API exposed smbus_smbalert_remove_cb() and smbus_host_notify_remove_cb() as Zephyr syscalls. Their verifiers in drivers/smbus/smbus_handlers.c validated only the dev argument with K_SYSCALL_OBJ(dev, K_OBJ_DRIVER_SMBUS) and forwarded the caller-supplied struct smbus_callback *cb pointer into kernel-mode driver code without any K_SYSCALL_MEMORY_READ/K_SYSCALL_MEMORY_WRITE validation. A companion change in 2023 had already removed the matching smbus_smbalert_set_cb() / smbus_host_notify_set_cb() syscalls for this reason, but the two removal syscalls were left exposed. On a build with CONFIG_USERSPACE=y, CONFIG_SMBUS=y and a driver implementing the callback operations (drivers/smbus/intel_pch_smbus.c with CONFIG_SMBUS_INTEL_PCH_SMBALERT/CONFIG_SMBUS_INTEL_PCH_HOST_NOTIFY, or drivers/smbus/smbus_stm32.c with CONFIG_SMBUS_STM32_SMBALERT), any user-mode thread that has been granted the SMBus device object can invoke these syscalls with an arbitrary pointer. The value reaches smbus_callback_remove() in drivers/smbus/smbus_utils.h, which uses it as a node identity against the kernel's sys_slist_t of registered callbacks. The consequence is that an unprivileged thread can unregister an SMBALERT or Host Notify callback that a supervisor-mode component registered, silently disabling alert handling for the rest of the system; because Zephyr images have fixed symbol addresses and the syscall returns 0 on a hit versus -ENOENT on a miss, the target address is both derivable and searchable. In builds with CONFIG_ASSERT=y the __ASSERT(callback->handler, ...) check additionally dereferences the caller-supplied address in supervisor mode, so a bogus pointer raises a kernel-mode fault and a fatal system error, and the fault/no-fault outcome discloses which addresses are mapped. The fix removes both syscall entry points, demoting the two functions to ordinary static inline calls so that callback list manipulation is available only to supervisor-mode code. There is no impact on builds without CONFIG_USERSPACE, and no impact on configurations that do not enable an SMBus driver with SMBALERT or Host Notify support.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

