CVE-2026-98763usb: core: clear both ep_in and ep_out for non-ep0 control endpoints

Official description

In the Linux kernel, the following vulnerability has been resolved: usb: core: clear both ep_in and ep_out for non-ep0 control endpoints In usb_enable_endpoint(), non-zero control endpoints (where usb_endpoint_xfer_control(&ep->desc) is true) populate both dev->ep_in[epnum] and dev->ep_out[epnum] with the same struct usb_host_endpoint pointer. However, usb_disable_endpoint() only clears either dev->ep_out[epnum] or dev->ep_in[epnum] depending on the direction bit of epaddr when reset_hardware is set, leaving the opposite direction's array slot pointing to the disabled/freed endpoint. Clear both dev->ep_out[epnum] and dev->ep_in[epnum] when disabling a non-ep0 control endpoint with reset_hardware set, and update the function kerneldoc accordingly. Tested in QEMU against Linux 7.3.0-rc3 using dummy_hcd and raw-gadget to enumerate a USB device with a non-zero control endpoint (bEndpointAddress 0x01, bmAttributes USB_ENDPOINT_XFER_CONTROL), verifying that both dev->ep_in[1] and dev->ep_out[1] are cleared when the interface is disabled.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/59d2c9d70fa42e2290ff68e6430d38a1c817fcb7
• https://git.kernel.org/stable/c/a7928ad4bbb330dfb0f726166384f319d66eb5d1
• https://git.kernel.org/stable/c/b521fe45e06b3f7042e6d1f9566ddb6f179dcb1d
• https://git.kernel.org/stable/c/198d74dcfa129523125f46a89479d3b446b17dbe
• https://git.kernel.org/stable/c/7a9f61476b0e8002092a52ee8295edeeb0a28d1e
• https://git.kernel.org/stable/c/1da16c46b8d7101b74bc2d72a04e23cf5c7ddea1
• https://git.kernel.org/stable/c/c50413ecb662ea43c7f487632c8114721743a277
• https://git.kernel.org/stable/c/0e8baa78d872f2db440d8b9ded946ab8dceb89eb