CVE-2026-72463

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

xfrm: Fix dev use-after-free in xfrm async resumption

xfrm async resumption hold skb->dev refcnt until after transport_finish.

However, xfrmrcvcb may modify skb->dev to tunnel dev without taking

device reference, such as vtircvcb. The subsequent async resumption

will decrement the tunnel device's reference count, which lead to uaf

of tunnel dev and refcnt leak of orig dev as below:

unregister_netdevice: waiting for vti1 to become free. Usage count = -2

Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set

by xfrmrcvcb can race with device teardown. Extend rcu protection over

xfrmrcvcb and transport_finish to prevent races.