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CVE-2026-72256

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_cluster: reject template conntracks in hash match xt_cluster_mt() treats any non-NULL nf_ct_get() result as a ful…

Published Aug 15, 2026EPSS 0.22%

Overview

CVE-2026-72256 is a known-severity vulnerability. It was published on August 15, 2026.

Technical description

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

netfilter: xt_cluster: reject template conntracks in hash match

xt_cluster_mt() treats any non-NULL nf_ct_get() result as a fully

initialized conntrack and passes it to xt_cluster_hash().

This causes a state confusion bug when the raw table CT target attaches

a template conntrack to skb->_nfct before normal conntrack processing.

Templates carry IPS_TEMPLATE status but do not have a valid tuple for

hashing yet, so xt_cluster_hash() can hit its WARN_ON() path on the

zeroed l3num field.

Reject template conntracks before hashing them. This matches existing

netfilter handling for template objects and avoids hashing incomplete

conntrack state.

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/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5Refgit.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62Refgit.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557dRefgit.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79eRefgit.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aaRefgit.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541eRefgit.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9ccRefgit.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72256?

CVE-2026-72256 is a known-severity vulnerability. It was published on August 15, 2026.

How severe is CVE-2026-72256?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-72256?

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-2026-72256?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72256 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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