Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f41ffcd656615754741f190afca00ca3c4bde9f1 to < 5f359265f616873edf32db418bd1513fdae3ddecaffecteddcfe437492e27d54f3ac491aed024da760f5c43c to < 448e95c0f3eaa8d99f16ccae92ab94545f14413baffecteddcfe437492e27d54f3ac491aed024da760f5c43c to < 93e08b13a7a30e4e78556d993720e0bc36231ec7affecteddcfe437492e27d54f3ac491aed024da760f5c43c to < 9c855832790cd488d87de1885974f4c37cfe7358affected5212f8f452b87318e735ca304728f6f8fb55ff7baffected6.6.160 to < 6.7affected
Linux Linux
Default version status: affected
6.14affected0 to < 6.14unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected