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CVE-2026-23272

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets publis…

Published Mar 20, 2026EPSS 0.13%

Overview

CVE-2026-23272 is a high-severity vulnerability. It was published on March 20, 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: unconditionally bump set->nelems before insertion

In case that the set is full, a new element gets published then removed

without waiting for the RCU grace period, while RCU reader can be

walking over it already.

To address this issue, add the element transaction even if set is full,

but toggle the set_full flag to report -ENFILE so the abort path safely

unwinds the set to its previous state.

As for element updates, decrement set->nelems to restore it.

A simpler fix is to call synchronize_rcu() in the error path.

However, with a large batch adding elements to already maxed-out set,

this could cause noticeable slowdown of such batches.

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/25fcaef7948912652905e96922f36583a84fffedRefgit.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0cRefgit.kernel.org/stable/c/86bc4b1a0f672d47ac19f9022432cb6a2e01cb33Refgit.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21Refgit.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733aRefgit.kernel.org/stable/c/e3ccb11fc8249759d23326038c8db987ddaabc77

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23272?

CVE-2026-23272 is a high-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23272?

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-2026-23272?

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-2026-23272?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23272 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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