In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition<\/p>\n
In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with
\ndwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue
\nthis delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM
\nevent is received.<\/p>\n
If we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and
\nthe memory allocated for dep with kzalloc() is released by kfree(dep),
\nwhile the delayed work mentioned above may still be pending or
\nrunning. The sequence of operations that may lead to a UAF bug is as
\nfollows:<\/p>\n
CPU0 CPU1<\/p>\n
| dwc3_thread_interrupt
\n | dwc3_endpoint_interrupt
\n | dwc3_gadget_endpoint_stream_event
\n | queue_delayed_work(system_percpu_wq,
\n | &dep->nostream_work)
\ndwc3_gadget_free_endpoints |
\ndwc3_free_trb_pool(dep) |
\nlist_del(&dep->endpoint.ep_list) |
\ndwc3_debugfs_remove_endpoint_dir(dep) |
\nkfree(dep) |
\n\/\/ dep is freed |
\n | dwc3_nostream_work
\n | \/\/ use dep (use-after-free)<\/p>\n
Fix it by canceling the delayed work before kfree(dep) in
\ndwc3_gadget_free_endpoints.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition<\/p>\n
In dwc3_gadget_init_endpoint, &dep->nost<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21661","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21661"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}