Linux Kernel VKMS Driver Use-After-Free and Double-Free Vulnerability

A use-after-free and double-free vulnerability has been identified in the Linux kernel's VKMS (Virtual Kernel Mode Setting) driver. This issue arises when the driver initialization fails, leading the `vkms_exit()` function to access an uninitialized or freed `default_config` pointer, potentially causing a double free. The vulnerability has been addressed by ensuring that `default_config` is only initialized after a successful driver initialization.

Impact

Exploitation of this vulnerability could lead to memory corruption issues, such as use-after-free and double-free conditions, which can be exploited to execute arbitrary code or cause a denial-of-service by crashing the system.