usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89739
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:04 UTC
Updated2026-09-11 20:20:04 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dcfe437492e27d54f3ac491aed024da760f5c43c 448e95c0f3eaa8d99f16ccae92ab94545f14413b git Not specified
CNA Linux Linux affected dcfe437492e27d54f3ac491aed024da760f5c43c 93e08b13a7a30e4e78556d993720e0bc36231ec7 git Not specified
CNA Linux Linux affected dcfe437492e27d54f3ac491aed024da760f5c43c 9c855832790cd488d87de1885974f4c37cfe7358 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9c855832790cd488d87de1885974f4c37cfe7358 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/448e95c0f3eaa8d99f16ccae92ab94545f14413b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93e08b13a7a30e4e78556d993720e0bc36231ec7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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