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CVE-2026-31678

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detache…

Published Apr 25, 2026CWE-367EPSS 0.10%

Overview

CVE-2026-31678 is a high-severity vulnerability. It was published on April 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

openvswitch: defer tunnel netdev_put to RCU release

ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already

detached the device. Dropping the netdev reference in destroy can race

with concurrent readers that still observe vport->dev.

Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let

vport_netdev_free() drop the reference from the RCU callback, matching

the non-tunnel destroy path and avoiding additional synchronization

under RTNL.

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/42f0d3d81209654c08ffdde5a34b9b92d2645896Refgit.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486cRefgit.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eabRefgit.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffcRefgit.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8Refgit.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31678?

CVE-2026-31678 is a high-severity vulnerability. It was published on April 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31678?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31678?

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-2026-31678?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31678 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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