CVE-2026-64348

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

usb: free iso schedules on failed submit

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

Free the staged schedule from donenotlinked 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.