CVE-2025-39801
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-11-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: Remove WARN_ON for device endpoint command timeouts This commit addresses a rarely observed endpoint command timeout which causes kernel panic due to warn when 'panic_on_warn' is enabled and unnecessary call trace prints when 'panic_on_warn' is disabled. It is seen during fast software-controlled connect/disconnect testcases. The following is one such endpoint command timeout that we observed: 1. Connect ======= ->dwc3_thread_interrupt ->dwc3_ep0_interrupt ->configfs_composite_setup ->composite_setup ->usb_ep_queue ->dwc3_gadget_ep0_queue ->__dwc3_gadget_ep0_queue ->__dwc3_ep0_do_control_data ->dwc3_send_gadget_ep_cmd 2. Disconnect ========== ->dwc3_thread_interrupt ->dwc3_gadget_disconnect_interrupt ->dwc3_ep0_reset_state ->dwc3_ep0_end_control_data ->dwc3_send_gadget_ep_cmd In the issue scenario, in Exynos platforms, we observed that control transfers for the previous connect have not yet been completed and end transfer command sent as a part of the disconnect sequence and processing of USB_ENDPOINT_HALT feature request from the host timeout. This maybe an expected scenario since the controller is processing EP commands sent as a part of the previous connect. It maybe better to remove WARN_ON in all places where device endpoint commands are sent to avoid unnecessary kernel panic due to warn.
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Meta Information
Published
2025-09-15
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-15
EPSS Evaluated
2026-06-14
NVD
CVE-2025-39801
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel 6.1.153
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Impact Analysis

If your system uses the affected Linux kernel USB driver and is configured with panic_on_warn enabled, this vulnerability can cause unexpected kernel panics during rapid USB device connect and disconnect operations. This can lead to system instability or crashes. Without panic_on_warn enabled, it may cause unnecessary kernel warning messages and call trace prints, which could clutter logs but not crash the system.

Executive Summary

This vulnerability involves a rarely observed endpoint command timeout in the Linux kernel's USB driver (dwc3). During fast software-controlled connect/disconnect test cases, certain USB control transfers from a previous connection may not complete before a disconnect sequence begins, causing a timeout. This timeout triggers a WARN_ON warning, which can lead to a kernel panic if the system is configured to panic on warnings. The fix removes these WARN_ON calls to prevent unnecessary kernel panics and call trace prints caused by these timeouts.

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