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CVE-2025-38448

4.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Fix race condition in TTY wakeup A race condition occurs when gs_start_io() calls either gs_start_rx() o…

Published Jul 25, 2025CWE-362EPSS 0.13%

Overview

CVE-2025-38448 is a medium-severity vulnerability. It was published on July 25, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

usb: gadget: u_serial: Fix race condition in TTY wakeup

A race condition occurs when gs_start_io() calls either gs_start_rx() or

gs_start_tx(), as those functions briefly drop the port_lock for

usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear

port.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

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8Refgit.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9Refgit.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661Refgit.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9Refgit.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359Refgit.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5Refgit.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014ebRefgit.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38448?

CVE-2025-38448 is a medium-severity vulnerability. It was published on July 25, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-38448?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38448?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38448?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38448 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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