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CVE-2025-21838 – “Linux USB Gadget Workqueue Queue Flush Denial of Service”

The following table lists the changes that have been made to the
CVE-2025-21838 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 07, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    usb: gadget: core: flush gadget workqueue after device removal

    device_del() can lead to new work being scheduled in gadget->work
    workqueue. This is observed, for example, with the dwc3 driver with the
    following call stack:
    device_del()
    gadget_unbind_driver()
    usb_gadget_disconnect_locked()
    dwc3_gadget_pullup()
    dwc3_gadget_soft_disconnect()
    usb_gadget_set_state()
    schedule_work(&gadget->work)

    Move flush_work() after device_del() to ensure the workqueue is cleaned
    up.
    Added Reference https://git.kernel.org/stable/c/399a45e5237ca14037120b1b895bd38a3b4492ea
    Added Reference https://git.kernel.org/stable/c/859cb45aefa6de823b2fa7f229fe6d9562c9f3b7
    Added Reference https://git.kernel.org/stable/c/97695b5a1b5467a4f91194db12160f56da445dfe
    Added Reference https://git.kernel.org/stable/c/f894448f3904d7ad66fecef8f01fe0172629e091
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