Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2025-38448

Severity CVSS v4.0:
Pending analysis
Type:
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Publication date:
25/07/2025
Last modified:
22/12/2025

Description

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

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 4.70 MEDIUM
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
4.70
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 3.5 (including) 5.4.296 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.5 (including) 5.10.240 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.189 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.146 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.99 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.39 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.15.7 (excluding)
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools