RT-Thread through 5.0.2 generates random numbers with a weak algorithm of "seed = 214013L * seed + 2531011L; return (seed >> 16) & 0x7FFF;" in calc_random in drivers/misc/rt_random.c.
https://security.humanativaspa.it/multiple-vulnerabilities-in-rt-thread-rtos/
https://seclists.org/fulldisclosure/2024/Mar/28
https://github.com/hnsecurity/vulns/blob/main/HNS-2024-05-rt-thread.txt