What’s Vulnerable › Vulnerabilities

CVE-2025-21838: usb: gadget: core: flush gadget workqueue after device removal

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-07 · updated 2026-10-15

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.

Affected products

• Linux kernel: from 3.12 before 6.1.130; from 6.2 before 6.6.80; from 6.7 before 6.12.16; from 6.13 before 6.13.4; 6.14-rc1, 6.14-rc2 — fixed in 6.1.130, 6.12.16, 6.13.4, 6.6.80

How to fix

Upgrade to a fixed version: Linux kernel 6.1.130, 6.12.16, 6.13.4, 6.6.80. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/399a45e5237ca14037120b1b895bd38a3b4492ea
• https://git.kernel.org/stable/c/859cb45aefa6de823b2fa7f229fe6d9562c9f3b7
• https://git.kernel.org/stable/c/97695b5a1b5467a4f91194db12160f56da445dfe
• https://git.kernel.org/stable/c/e3bc1a9a67ce33a2e761e6e7b7c2afc6cb9b7266
• https://git.kernel.org/stable/c/f894448f3904d7ad66fecef8f01fe0172629e091
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

Get alerted when CVE-2025-21838 or the next vulnerability affects your stack