CVE-2026-74456

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

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error

In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc()

and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also

frees the transfer buffer.

If usb_submit_urb() fails, the error path frees the buffer explicitly with

kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set,

usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double

free of the transfer buffer.

BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0

Free of addr ffff8881069ccb80 by task trigger.sh/285

Call Trace:

kfree+0x113/0x3c0

usb_free_urb.part.0+0x91/0xb0

Drop the redundant kfree(buf); usb_free_urb() already releases the transfer

buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free

issue with interrupt buffer allocation").