CVE-2026-19947

The device multiplexer pseudo-driver in drivers/misc/devmux/devmux.c contains an authorization flaw where the system calls devmux_select_get() and devmux_select_set() bypass kernel-object validation. When CONFIG_USERSPACE and CONFIG_DEVMUX are enabled, user-mode verifiers fail to perform k_object...

CVE-2026-19947 Missing kernel object permission check in devmux syscalls allows unprivileged user threads to retarget a device multiplexer

The device multiplexer pseudo-driver in drivers/misc/devmux/devmux.c exposes two system calls, devmuxselectget and devmuxselectset. When CONFIGUSERSPACE is enabled, their user-mode verifiers zvrfydevmuxselectget and zvrfydevmuxselectset forwarded directly to the kernel implementations without...