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CVE-2026-52921

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash:* range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,i…

Published Jun 24, 2026CWE-835EPSS 0.11%

Overview

CVE-2026-52921 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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: ipset: stop hash:* range iteration at end

The following hash set variants:

hash:ip,mark

hash:ip,port

hash:ip,port,ip

hash:ip,port,net

iterate IPv4 ranges with a 32-bit iterator.

The iterator must stop once the last address in the requested range has

been processed. Advancing it once more can move the traversal state past

the end of the request, so a later retry may continue from an unintended

position.

Handle the iterator increment explicitly at the end of the loop and stop

once the upper bound has been processed. This keeps the existing retry

behaviour intact for valid ranges while preventing traversal from

continuing past the original boundary.

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/02f75f041a93ea045834da89cd3234f4c1d749b4Refgit.kernel.org/stable/c/0b530efb2cc9dbdddfd49d392e3a857f0d4ce8dcRefgit.kernel.org/stable/c/0d3a282ab5f165fc207ff49ea5b6ad8f54616bd6Refgit.kernel.org/stable/c/0d7b33ace701fe397e6e4de145f32e098178d901Refgit.kernel.org/stable/c/383418c20e69f5761b6ec5238f599423f4fb77fbRefgit.kernel.org/stable/c/952e988163c2ab9939c3db9f0f8e77af6a1bb436Refgit.kernel.org/stable/c/be75218fadea22e59c8673db212f29c681bf45bbRefgit.kernel.org/stable/c/c281e018af98df91827d65bec00f4956c00a1b02

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52921?

CVE-2026-52921 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-52921?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-52921?

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-2026-52921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52921 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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