CVE-2026-23158gpio: virtuser: fix UAF in configfs release path

Official description

In the Linux kernel, the following vulnerability has been resolved: gpio: virtuser: fix UAF in configfs release path The gpio-virtuser configfs release path uses guard(mutex) to protect the device structure. However, the device is freed before the guard cleanup runs, causing mutex_unlock() to operate on freed memory. Specifically, gpio_virtuser_device_config_group_release() destroys the mutex and frees the device while still inside the guard(mutex) scope. When the function returns, the guard cleanup invokes mutex_unlock(&dev->lock), resulting in a slab use-after-free. Limit the mutex lifetime by using a scoped_guard() only around the activation check, so that the lock is released before mutex_destroy() and kfree() are called.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/815a8e3bf72811d402b30bd4a53cde5e9df7a563
• https://git.kernel.org/stable/c/7bec90f605cfb138006f5ba575f2310593347110
• https://git.kernel.org/stable/c/53ad4a948a4586359b841d607c08fb16c5503230