CVE-2026-63919

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 7ee59eda8820b758ed29e1cd3222359c7b97302caffected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 2df7059a18afb7d3aee6c36cad5d371c198111d4affected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 8dfabcba6a943a7a02ebe1e1637c361ba96acbaaaffected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 48ce101cd630d6745b6923b5bad8358bc4c119daaffected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 55ddfc41451f01c588089cd74957a05311b6f202affected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 9f7ebb45a83afc3216e855e57d51bb4bc9b5232eaffected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < 9f67a36e91bb50d358760f381f233913fe5c09f8affected
LinuxLinux7b3801927e52f8621de311277f7fc727635019e7 < c16f74dc1d75d0e2e7670076d5375deda110ebebaffected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References