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CVE-2026-23083

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO.

Published Feb 4, 2026EPSS 0.15%

Overview

CVE-2026-23083 is a high-severity vulnerability. It was published on February 4, 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:

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

fou_udp_recv() has the same problem mentioned in the previous

patch.

If FOU_ATTR_IPPROTO is set to 0, skb is not freed by

fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu().

Let's forbid 0 for FOU_ATTR_IPPROTO.

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/1cc98b8887cabb1808d2f4a37cd10a7be7574771Refgit.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91eaRefgit.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19Refgit.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5Refgit.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956Refgit.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823Refgit.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03Refcert-portal.siemens.com/productcert/html/ssa-019113.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23083?

CVE-2026-23083 is a high-severity vulnerability. It was published on February 4, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23083?

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-2026-23083?

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-2026-23083?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23083 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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