CVE-2025-21838

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/399a45e5237ca14037120b1b895bd38a3b4492ea ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/399a45e5237ca14037120b1b895bd38a3b4492eaPatch
• https://git.kernel.org/stable/c/859cb45aefa6de823b2fa7f229fe6d9562c9f3b7Patch
• https://git.kernel.org/stable/c/97695b5a1b5467a4f91194db12160f56da445dfePatch
• https://git.kernel.org/stable/c/e3bc1a9a67ce33a2e761e6e7b7c2afc6cb9b7266Patch
• https://git.kernel.org/stable/c/f894448f3904d7ad66fecef8f01fe0172629e091Patch
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html