CVE-2025-21746

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.

The following products are affected by CVE-2025-21746 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-21746.

URL	Resource
https://git.kernel.org/stable/c/08bd5b7c9a2401faabdaa1472d45c7de0755fd7e
https://git.kernel.org/stable/c/3e179d3f1ada963475395d81bfe91daef4d1a24c
https://git.kernel.org/stable/c/87da1ea93ec9f9f0004e5b12e78789bc94e360bf
https://git.kernel.org/stable/c/a2cbcd70133dc0d4d4c95ad4cd5412b935354c7c
https://lore.kernel.org/linux-cve-announce/2025022600-CVE-2025-21746-380d@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21746
https://www.cve.org/CVERecord?id=CVE-2025-21746