cve/2025/CVE-2025-38448.md

CVE-2025-38448

Description

In the Linux kernel, the following vulnerability has been resolved:usb: gadget: u_serial: Fix race condition in TTY wakeupA race condition occurs when gs_start_io() calls either gs_start_rx() orgs_start_tx(), as those functions briefly drop the port_lock forusb_ep_queue(). This allows gs_close() and gserial_disconnect() to clearport.tty and port_usb, respectively.Use the null-safe TTY Port helper function to wake up TTY.Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE

POC

Reference

No PoCs from references.

Github

• https://github.com/w4zu/Debian_security