CVE-2026-16513 Missing write validation of user-supplied handle pointer in the RTIO syscall verifier allows arbitrary kernel write

The userspace verifier zvrfyrtiosqecopyingethandles in subsys/rtio/rtiosyscalls.c subsys/rtio/rtiohandlers.c before v4.3.0 validated the RTIO object handle and the sqes input array, but not the handle out-parameter. On the first loop iteration it executed handle = sqe, storing the kernel address ...