Description

In the Linux kernel, the following vulnerability has been resolved:

Input: synaptics - fix crash when enabling pass-through port

When enabling a pass-through port an interrupt might come before psmouse
driver binds to the pass-through port. However synaptics sub-driver
tries to access psmouse instance presumably associated with the
pass-through port to figure out if only 1 byte of response or entire
protocol packet needs to be forwarded to the pass-through port and may
crash if psmouse instance has not been attached to the port yet.

Fix the crash by introducing open() and close() methods for the port and
check if the port is open before trying to access psmouse instance.
Because psmouse calls serio_open() only after attaching psmouse instance
to serio port instance this prevents the potential crash.

Classification

CVE ID: CVE-2025-21746

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 4.16% (scored less or equal to compared to others)

EPSS Date: 2025-03-27 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-21746
https://git.kernel.org/stable/c/87da1ea93ec9f9f0004e5b12e78789bc94e360bf
https://git.kernel.org/stable/c/08bd5b7c9a2401faabdaa1472d45c7de0755fd7e

Timeline