CVE-2026-98773

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

USB: cdc-acm: skip URB restart in port_shutdown if disconnected

acm_port_shutdown() is called from the tty-port machinery whenever the

last user closes the port. acm_disconnect() sets acm->disconnected and

calls tty_port_tty_vhangup(), which eventually triggers port_shutdown().

At that point acm_disconnect() has already called acm_poison_urbs() and

is about to free the control and read URBs.

However, acm_port_shutdown() unconditionally calls acm_unpoison_urbs()

and, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the

ctrlurb and all read URBs. If the concurrent acm_disconnect() then

frees those URBs and their DMA buffers while they are in-flight, the

result is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback()

accessing the freed DMA memory.

Fix by checking acm->disconnected after draining the delayed anchor and

returning early: if we are in a disconnect path the URBs must remain

poisoned and must not be resubmitted.

The early return is placed after the delayed-anchor drain loop because

that loop only cancels write-side accounting (wb->use = false and

autopm counter) and does not touch the hardware path.