CVE-2025-21746

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Input: synaptics - fix crash when enabling pass-through port<br /> <br /> When enabling a pass-through port an interrupt might come before psmouse<br /> driver binds to the pass-through port. However synaptics sub-driver<br /> tries to access psmouse instance presumably associated with the<br /> pass-through port to figure out if only 1 byte of response or entire<br /> protocol packet needs to be forwarded to the pass-through port and may<br /> crash if psmouse instance has not been attached to the port yet.<br /> <br /> Fix the crash by introducing open() and close() methods for the port and<br /> check if the port is open before trying to access psmouse instance.<br /> Because psmouse calls serio_open() only after attaching psmouse instance<br /> to serio port instance this prevents the potential crash.