CVE-2026-63919

Description

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().

References

• 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