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Change History

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

xfrm: hold dev ref until after transport_finish NF_HOOK

After async crypto completes, xfrm_input_resume() calls dev_put()
immediately on re-entry before the skb reaches transport_finish.
The skb->dev pointer is then used inside NF_HOOK and its okfn,
which can race with device teardown.

Remove the dev_put from the async resumption entry and instead
drop the reference after the NF_HOOK call in transport_finish,
using a saved device pointer since NF_HOOK may consume the skb.
This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip
the okfn.

For non-transport exits (decaps, gro, drop) and secondary
async return points, release the reference inline when
async is set.

https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b

https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb

https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2