CVE-2026-23061: can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak

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

can: kvaserusb: kvaserusbreadbulkcallback(): fix URB memory leak

Fix similar memory leak as in commit 7352e1d5932a ("can: gsusb: gsusbreceivebulkcallback(): fix URB memory leak").

In kvaserusbset{,data}bittiming() -> kvaserusbsetuprxurbs(), the URBs for USB-in transfers are allocated, added to the dev->rxsubmitted anchor and submitted. In the complete callback kvaserusbreadbulkcallback(), the URBs are processed and resubmitted. In kvaserusbremoveinterfaces() the URBs are freed by calling usbkillanchoredurbs(&dev->rxsubmitted).

However, this does not take into account that the USB framework unanchors the URB before the complete function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in usbkillanchoredurbs().

Fix the memory leak by anchoring the URB in the kvaserusbreadbulkcallback() to the dev->rxsubmitted anchor.