CVE-2026-23009 xhci: sideband: don't dereference freed ring when removing sideband endpoint

In the Linux kernel, the following vulnerability has been resolved: xhci: sideband: don't dereference freed ring when removing sideband endpoint xhcisidebandremoveendpoint incorrecly assumes that the endpoint is running and has a valid transfer ring. Lianqin reported a crash during suspend/wake-u...