CVE-2026-89739 is a vulnerability in Linux Kernel
Published on September 11, 2026
usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition
In the Linux kernel, the following vulnerability has been resolved:
usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition
In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with
dwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue
this delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM
event is received.
If we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and
the memory allocated for dep with kzalloc() is released by kfree(dep),
while the delayed work mentioned above may still be pending or
running. The sequence of operations that may lead to a UAF bug is as
follows:
CPU0 CPU1
| dwc3_thread_interrupt
| dwc3_endpoint_interrupt
| dwc3_gadget_endpoint_stream_event
| queue_delayed_work(system_percpu_wq,
| &dep->nostream_work)
dwc3_gadget_free_endpoints |
dwc3_free_trb_pool(dep) |
list_del(&dep->endpoint.ep_list) |
dwc3_debugfs_remove_endpoint_dir(dep) |
kfree(dep) |
// dep is freed |
| dwc3_nostream_work
| // use dep (use-after-free)
Fix it by canceling the delayed work before kfree(dep) in
dwc3_gadget_free_endpoints.
Products Associated with CVE-2026-89739
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Affected Versions
Linux:- Version dcfe437492e27d54f3ac491aed024da760f5c43c and below 448e95c0f3eaa8d99f16ccae92ab94545f14413b is affected.
- Version dcfe437492e27d54f3ac491aed024da760f5c43c and below 93e08b13a7a30e4e78556d993720e0bc36231ec7 is affected.
- Version dcfe437492e27d54f3ac491aed024da760f5c43c and below 9c855832790cd488d87de1885974f4c37cfe7358 is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 6.18.50, <= 6.18.* is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.