CVE-2026-63919

xfrm: input: hold netns during deferred transport reinjection

State: Published
Severity: 8.8 High
Published: Jul 19, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

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().

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	7b3801927e52f8621de311277f7fc727635019e7 to before 7ee59eda8820b758ed29e1cd3222359c7b97302cAffected 7b3801927e52f8621de311277f7fc727635019e7 to before 2df7059a18afb7d3aee6c36cad5d371c198111d4Affected 7b3801927e52f8621de311277f7fc727635019e7 to before 8dfabcba6a943a7a02ebe1e1637c361ba96acbaaAffected 7b3801927e52f8621de311277f7fc727635019e7 to before 48ce101cd630d6745b6923b5bad8358bc4c119daAffected 7b3801927e52f8621de311277f7fc727635019e7 to before 55ddfc41451f01c588089cd74957a05311b6f202Affected 7b3801927e52f8621de311277f7fc727635019e7 to before 9f7ebb45a83afc3216e855e57d51bb4bc9b5232eAffected 7b3801927e52f8621de311277f7fc727635019e7 to before 9f67a36e91bb50d358760f381f233913fe5c09f8Affected 7b3801927e52f8621de311277f7fc727635019e7 to before c16f74dc1d75d0e2e7670076d5375deda110ebebAffected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.93 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.12 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

7b3801927e52f8621de311277f7fc727635019e7 to before 7ee59eda8820b758ed29e1cd3222359c7b97302cAffected
7b3801927e52f8621de311277f7fc727635019e7 to before 2df7059a18afb7d3aee6c36cad5d371c198111d4Affected
7b3801927e52f8621de311277f7fc727635019e7 to before 8dfabcba6a943a7a02ebe1e1637c361ba96acbaaAffected
7b3801927e52f8621de311277f7fc727635019e7 to before 48ce101cd630d6745b6923b5bad8358bc4c119daAffected
7b3801927e52f8621de311277f7fc727635019e7 to before 55ddfc41451f01c588089cd74957a05311b6f202Affected
7b3801927e52f8621de311277f7fc727635019e7 to before 9f7ebb45a83afc3216e855e57d51bb4bc9b5232eAffected
7b3801927e52f8621de311277f7fc727635019e7 to before 9f67a36e91bb50d358760f381f233913fe5c09f8Affected
7b3801927e52f8621de311277f7fc727635019e7 to before c16f74dc1d75d0e2e7670076d5375deda110ebebAffected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.93 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.12 through 7.0.*Not affected
7.1 and laterNot affected

References

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