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CVE-2026-23392

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks fr…

Published Mar 25, 2026CWE-416EPSS 0.13%

Overview

CVE-2026-23392 is a high-severity vulnerability. It was published on March 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:

netfilter: nf_tables: release flowtable after rcu grace period on error

Call synchronize_rcu() after unregistering the hooks from error path,

since a hook that already refers to this flowtable can be already

registered, exposing this flowtable to packet path and nfnetlink_hook

control plane.

This error path is rare, it should only happen by reaching the maximum

number hooks or by failing to set up to hardware offload, just call

synchronize_rcu().

There is a check for already used device hooks by different flowtable

that could result in EEXIST at this late stage. The hook parser can be

updated to perform this check earlier to this error path really becomes

rarely exercised.

Uncovered by KASAN reported as use-after-free from nfnetlink_hook path

when dumping hooks.

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/7e3955b282eae20d61c75e499c75eade51c20060Refgit.kernel.org/stable/c/adee3436ccd29f1e514c028899e400cbc6d84065Refgit.kernel.org/stable/c/c8092edb9a11f20f95ccceeb9422b7dd0df337bdRefgit.kernel.org/stable/c/d2632de96ccb066e0131ad1494241b9c281c60b8Refgit.kernel.org/stable/c/d73f4b53aaaea4c95f245e491aa5eeb8a21874ceRefgit.kernel.org/stable/c/e78a2dcc7cfb87b64a631441ca7681492b347ef6Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23392?

CVE-2026-23392 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23392?

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-2026-23392?

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-2026-23392?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23392 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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