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

xfrm: input: hold netns during deferred transport reinjection

Transport-mode reinjection stores a struct net pointer in skb->cb and
uses it later from xfrm_trans_reinject(). That pointer must stay valid
until the deferred callback runs.

Take a netns reference when queueing deferred reinjection work and drop
it after the callback completes. Use maybe_get_net() so the queueing
path does not revive a namespace that is already being torn down.

This keeps the existing workqueue design and fixes the netns lifetime
handling in one place for all users of xfrm_trans_queue_net().

https://git.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4

https://git.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119da

https://git.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202

https://git.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302c

https://git.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaa

https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8

https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e

https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb

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