qt2_process_read_urb Heap Buffer Overflow DoS

Vulnerability of the qt2processreadurb function in the drivers/usb/serial/quatech2.c module – The driver for supporting USB devices in Linux operating systems contains errors in its code. Exploiting this vulnerability could allow an attacker to cause a service failure...

CVE-2025-21689 USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()

In the Linux kernel, the following vulnerability has been resolved: USB: serial: quatech2: fix null-ptr-deref in qt2processreadurb This patch addresses a null-ptr-deref in qt2processreadurb due to an incorrect bounds check in the following: if newport serial-numports deverr&port-dev, "%s - port...

CVE-2025-21689

The CVE concerns Linux kernel USB: serial (quatech2) where qt2_process_read_urb() could dereference NULL due to an out-of-bounds access. The root cause was an incorrect bounds check using if (newport > serial->num_ports) which allowed newport to reach serial->num_ports and make port NULL...