IT

Tracker / CVE-2025-21689

CVE-2025-21689

Medium 5.5

In the Linux kernel, the following vulnerability has been resolved: USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb() This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following: if (newport > serial->num_ports) { dev_err(&port->dev, "%s - port change to invalid port: %i\n", __func__, newport); break; } The condition doesn't account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of "port" in the following code is out-of-bounds and NULL: serial_priv->current_port = newport; port = serial->port[serial_priv->current_port]; The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.

Affected products and versions

linux linux_kernel
linux linux_kernel · 3.5 → 5.4.290
linux linux_kernel · 5.11 → 5.15.178
linux linux_kernel · 5.16 → 6.1.128
linux linux_kernel · 5.5 → 5.10.234
linux linux_kernel · 6.2 → 6.6.75
linux linux_kernel · 6.7 → 6.12.12

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References