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CVE-2026-63919

8.8 · HIGH

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…

Published Jul 19, 2026EPSS 0.65%

Overview

CVE-2026-63919 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4Refgit.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119daRefgit.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202Refgit.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302cRefgit.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaaRefgit.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8Refgit.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232eRefgit.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63919?

CVE-2026-63919 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-63919?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-63919?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63919?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63919 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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