xfrm: input: hold netns during deferred transport reinjection

Summary

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().

Timeline

1. Jul 19, 2026, 2:55 PM UTCCVE published
2. Oct 16, 2026, 3:33 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 8:17 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 7ee59eda8820b758ed29e1cd3222359c7b97302c; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 2df7059a18afb7d3aee6c36cad5d371c198111d4; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 48ce101cd630d6745b6923b5bad8358bc4c119da; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 55ddfc41451f01c588089cd74957a05311b6f202; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in 9f67a36e91bb50d358760f381f233913fe5c09f8; From 7b3801927e52f8621de311277f7fc727635019e7 · fixed in c16f74dc1d75d0e2e7670076d5375deda110ebeb

• Linux Linux

  5.6

• KernelLinux

  From 5.6.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.93; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12

References 8