CVE-2025-68312

Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-12-16

Last updated on: 2025-12-18

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: usbnet: Prevents free active kevent The root cause of this issue are: 1. When probing the usbnet device, executing usbnet_link_change(dev, 0, 0); put the kevent work in global workqueue. However, the kevent has not yet been scheduled when the usbnet device is unregistered. Therefore, executing free_netdev() results in the "free active object (kevent)" error reported here. 2. Another factor is that when calling usbnet_disconnect()->unregister_netdev(), if the usbnet device is up, ndo_stop() is executed to cancel the kevent. However, because the device is not up, ndo_stop() is not executed. The solution to this problem is to cancel the kevent before executing free_netdev().

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2025-12-16

Last Modified

2025-12-18

Generated

2026-07-06

AI Q&A

2025-12-16

EPSS Evaluated

2026-07-05

NVD

CVE-2025-68312

EUVD

EUVD-2025-203757

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability occurs in the Linux kernel's usbnet driver. When the usbnet device is probed, a kevent work is scheduled in the global workqueue, but it may not be scheduled before the device is unregistered. If free_netdev() is called while the kevent is still active, it causes a 'free active object (kevent)' error. Additionally, if the device is not up during disconnect, the kevent cancellation function (ndo_stop) is not called, leaving the kevent active. The fix involves cancelling the kevent before calling free_netdev().

Impact Analysis

This vulnerability can lead to a use-after-free or double-free error in the kernel, potentially causing system instability, crashes, or denial of service. It may affect the reliability of the usbnet device driver and could be exploited to disrupt normal device operation.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to ensure that the kevent is cancelled before executing free_netdev() when handling usbnet devices. This involves applying the patch or update that fixes the issue by preventing free active kevent errors during usbnet device unregistration.

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