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CVE-2026-72256

Published Aug 15, 2026 EPSS 0.22% (12th pctl)

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

Ref git.kernel.org/stable/c/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5 Ref git.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62 Ref git.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557d Ref git.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79e Ref git.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa Ref git.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541e Ref git.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9cc Ref git.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54

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's AI-powered security agents can automatically detect CVE-2026-72256 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

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