Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f41ffcd656615754741f190afca00ca3c4bde9f1 before 5f359265f616873edf32db418bd1513fdae3ddec; affected dcfe437492e27d54f3ac491aed024da760f5c43c before 448e95c0f3eaa8d99f16ccae92ab94545f14413b; affected dcfe437492e27d54f3ac491aed024da760f5c43c before 93e08b13a7a30e4e78556d993720e0bc36231ec7; affected dcfe437492e27d54f3ac491aed024da760f5c43c before 9c855832790cd488d87de1885974f4c37cfe7358; affected 5212f8f452b87318e735ca304728f6f8fb55ff7b; affected 6.6.160 before 6.7 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.