CVE-2026-19736
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
The NXP MCUX TRNG entropy driver in Zephyr (drivers/entropy/entropy_mcux_trng.c) passes the caller's byte count directly to the SDK routine TRNG_GetRandomData(), which on i.MX RT5xx/RT6xx parts always copies whole 32-bit words and rounds entropy draws up to a multiple of 128 bytes. A request length not a multiple of four causes an underflow in the SDK's buffer-full check, leading to an overflow of up to 127 bytes past the caller's buffer.
Risk Assessment
The vulnerability allows an unprivileged user-mode thread (with CONFIG_USERSPACE enabled) to write up to 127 bytes of uncontrolled content beyond its allocated buffer, potentially causing system crashes, kernel state corruption, or opportunistic privilege escalation. Affected devices include MIMXRT595S, MIMXRT555S, MIMXRT533S, MIMXRT685S, MIMXRT633S.
Recommendation
Update Zephyr RTOS to a version containing the fix that routes unaligned prefixes and sub-word tails through a local bounce word and hands the SDK only word-multiple sizes. Until patched, restrict access to the entropy device for unprivileged threads and avoid requesting lengths that are not multiples of four.
Other vulnerabilities in Zephyr RTOS
See all- CVE-2026-19595Medium
A vulnerability in the Zephyr RTOS syscall verifier: z_vrfy_rtio_cqe_get_mempool_buffer() validated its output parameters buff and buff_len with K_SYSCALL_MEMORY_READ() instead of K_SYSCALL_MEMORY_WRITE(). This allows an unprivileged user-mode thread to invoke the syscall with pointers to read-only memory, causing a supervisor-mode store outside the permitted region or a kernel fault that halts or reboots the device.
- CVE-2026-19940Medium
A vulnerability in the Bluetooth Classic Hands-Free Profile Audio Gateway (HFP AG) implementation in Zephyr RTOS causes corruption of the kernel timeout list. By sending AT+CIND? and quickly reconnecting, a remote attacker can trigger a system-wide fault or hang.
- CVE-2026-19575High
A vulnerability in Zephyr RTOS affects the user-mode verification handler z_vrfy_device_deinit() in kernel/device.c, which validated its dev argument with K_SYSCALL_OBJ_INIT(dev, K_OBJ_ANY). Because k_object_validate() short-circuits type comparison for K_OBJ_ANY, the check only verified that the pointer was the base address of some kernel object the calling thread was granted, without comparing the object's actual type. This allows a local user-mode thread to pass a thread stack object (e.g., from k_thread_stack_alloc()) and achieve supervisor-mode kernel code execution.
- CVE-2026-19574High
In the ARM64 MMU back-end of Zephyr RTOS, address space identifiers (ASIDs) are assigned by a bare round-robin counter, which after wrapping past 255 possible values can hand the same ASID to a new domain while a still-live domain holds it. Because domain-private mappings are installed as non-global (MT_NG), the ASID is the only tag separating cached translations in the TLB, and the context-switch path does not flush the TLB for a duplicate reached through a third domain. As a result, user-mode threads in one domain can read and write memory belonging to another domain, defeating memory-domain isolation.
- CVE-2026-19569High
A vulnerability in the Zephyr RTOS kernel allows an unprivileged user-mode thread to perform an out-of-bounds write in kernel memory. It stems from missing overflow checks when calculating allocation sizes for dynamic kernel objects, leading to undersized heap allocations. An attacker can exploit this to escalate privileges and execute arbitrary code at the kernel level.
- CVE-2026-19185High
A vulnerability was found in the system-call verifier for i3c_do_ccc() in Zephyr RTOS, which fails to validate per-target data pointers in the i3c_ccc_payload structure. The verifier also operates on the caller's live structure, allowing another thread to modify fields between check and use. This allows an unprivileged thread to write to arbitrary kernel addresses (via read CCC) or disclose kernel memory (via write CCC), leading to privilege escalation.
- CVE-2026-18747Medium
A vulnerability in the SMP-over-console transport in Zephyr RTOS allows an unauthenticated attacker to trigger a buffer length underflow by sending a single 7-byte frame to the management console. This leads to an out-of-bounds read, potentially causing a denial of service on the MCUmgr thread or memory disclosure.
- CVE-2026-18417Medium
In Zephyr RTOS, a vulnerability exists in the BSD socket layer where an asynchronous error was stored in the user_data field of the network context, which for listening TCP sockets is used to store a pointer to the parent context. In v4.3.0, after an interface-down event, the accept callback was not disarmed, leading to reuse of the poisoned value as a pointer and writes to an invalid address, causing a kernel fatal error (device crash or reset).
- CVE-2026-16513High
A vulnerability in the RTIO syscall verifier in Zephyr RTOS (before v4.3.0) allows an unprivileged user thread to write a pointer to controlled data at an arbitrary kernel address. The missing K_SYSCALL_MEMORY_WRITE check for the handle output parameter enables privilege escalation to kernel mode.
- CVE-2026-16514Medium
The gptp_mi_qualify_announce() function in Zephyr's gPTP subsystem processes received Announce messages by comparing clock identities. The comparison loop uses an attacker-controlled step count (steps_removed) instead of the actual number of TLV entries, leading to an out-of-bounds read. A single frame can cause about 2KB of overread, potentially crashing the networking RX thread and causing denial of service.
Original NVD description (English source)
The NXP MCUX TRNG entropy driver in drivers/entropy/entropy_mcux_trng.c passed the caller's byte count straight to the vendor SDK routine TRNG_GetRandomData(). On i.MX RT5xx and RT6xx parts the SDK compiles its TRNG_SW_HEALTH_TESTS variant, which always copies whole 32-bit words and draws entropy rounded up to a multiple of 128 bytes. Its "caller buffer is full" guard tests dataSize == 0, so a request whose length is not a multiple of four makes dataSize underflow past zero and the SDK keeps writing into the caller's buffer for the entire extraction: a 1-byte request results in 128 bytes written, and any non-word-multiple length overflows by up to 127 bytes. entropy_get_entropy() is a syscall, and its verifier in drivers/entropy/entropy_handlers.c validates only the requested length via K_SYSCALL_MEMORY_WRITE(). With CONFIG_USERSPACE enabled, an unprivileged user-mode thread that has merely been granted the entropy device can therefore choose both the destination address and a length such as 1, and cause the kernel to write up to 127 bytes beyond the region it proved it owns. On these Cortex-M33 targets there is no MMU, so user partitions and kernel data share one SRAM and the overflow can land in adjacent kernel state. The same defect is reached from kernel mode by any caller requesting a non-word-multiple length, including getentropy() and, in builds where sys_csrand_get()/sys_rand_get() resolve to the hardware generator, sys_rand8_get() and sys_rand16_get(). Impact is memory corruption of up to 127 bytes immediately following the supplied buffer — typically the caller's stack in kernel-mode use, or memory outside the caller's partition when driven through the syscall. The overflow offset is fully determined by the requested length and is therefore deterministic, while the written content is uncontrolled TRNG output; the practical consequences range from crashes and unpredictable state corruption to opportunistic escalation when kernel bookkeeping such as object permission bitmaps is overwritten. The affected devices are those where the MCUX SDK enables TRNG_SW_HEALTH_TESTS (MIMXRT595S, MIMXRT555S, MIMXRT533S, MIMXRT685S, MIMXRT633S), on which the TRNG is the zephyr,entropy chosen node; other SoCs using this driver take the SDK path that clamps the copy size and are unaffected. The fix routes any unaligned prefix and any sub-word tail through a local bounce word and hands the SDK only word-multiple sizes, so the SDK's word-granular writes can no longer pass the end of the caller's buffer.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS