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CVE-2026-72256

UnknownEPSS 0.21%

Last modified

CVE-2026-72256 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0269ea4937343536ec7e85649932bc8c9686ea78, < 4558bd7b47c7be82dffd837f27be8ea3ecee557d; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < d5f9d050b0b267227c1f02f11021872c7768a9cc; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < 4cb8b5f586e41c187942291cc0938006077fa79e; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < fac2fdac3baad9ffd12b3b0bba4374d4b3585d54; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < 13ea4f86cf738c74be2146886ac261988a631e62; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa; >= 0269ea4937343536ec7e85649932bc8c9686ea78, < 5feba91006ec92da57acc1cc2e34df623b98541e
LinuxLinux2.6.30

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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 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.
How severe is CVE-2026-72256?
Severity scoring for CVE-2026-72256 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72256?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST