High 8.8Published Jul 19, 2026

CVE-2026-63919xfrm: input: hold netns during deferred transport reinjection

Updated under an hour ago (Oct 28, 2026, 10:10 PM ET)

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Exploited in the last 30 days

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().

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7b3801927e52f8621de311277f7fc727635019e7 before 7ee59eda8820b758ed29e1cd3222359c7b97302c; 7b3801927e52f8621de311277f7fc727635019e7 builds before 2df7059a18afb7d3aee6c36cad5d371c198111d4; from 7b3801927e52f8621de311277f7fc727635019e7 before 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa; from 7b3801927e52f8621de311277f7fc727635019e7 before 48ce101cd630d6745b6923b5bad8358bc4c119da; from 7b3801927e52f8621de311277f7fc727635019e7 before 55ddfc41451f01c588089cd74957a05311b6f202; from 7b3801927e52f8621de311277f7fc727635019e7 before 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e; from 7b3801927e52f8621de311277f7fc727635019e7 before 9f67a36e91bb50d358760f381f233913fe5c09f8; from 7b3801927e52f8621de311277f7fc727635019e7 before c16f74dc1d75d0e2e7670076d5375deda110ebeb	CNA record
linux linux_kernel linux:linux_kernel	from 5.6 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302c	patch
https://git.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4	patch
https://git.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaa	patch
https://git.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119da	patch
https://git.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202	patch
https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e	patch
https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8	patch
https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.