In the Linux kernel, the following vulnerability has been resolved:

usb: free iso schedules on failed submit

EHCI and FOTG210 isochronous submits build an ehci_iso_sched before
linking the URB to the endpoint queue, and keep the staged schedule in
urb->hcpriv until iso_stream_schedule() and the link helpers consume it.
If the controller is no longer accessible, or usb_hcd_link_urb_to_ep()
fails, submit jumps to done_not_linked before that handoff happens and
leaks the staged schedule still attached to urb->hcpriv.

Free the staged schedule from done_not_linked when submit fails before
the URB is linked and clear urb->hcpriv after the free.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still
present in v7.1.1.

An x86_64 allyesconfig build showed no new warnings. As we do not have an
EHCI host controller with a USB isochronous device to test with, no
runtime testing was able to be performed.

https://git.kernel.org/stable/c/4bb88aee6b868cbf73bf453f62497802f5fe4769

https://git.kernel.org/stable/c/6bc17a78a05671d303820224fb37ca339c1dc2cb

https://git.kernel.org/stable/c/8890699eea19027ef6e4f9cbcf27cba5e789793f

https://git.kernel.org/stable/c/b0d00d077f9738d215af9b50c74dffab7a1de19f

https://git.kernel.org/stable/c/b9399d25fbb34a05bbe76eeedd730f62ff2670e9

https://git.kernel.org/stable/c/be5004395dfd0b6ec310db359f887fa396fd0dd2

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