CVE-2026-72256
netfilter: xt_cluster: reject template conntracks in hash match
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < 4558bd7b47c7be82dffd837f27be8ea3ecee557d (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < d5f9d050b0b267227c1f02f11021872c7768a9cc (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < 4cb8b5f586e41c187942291cc0938006077fa79e (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < fac2fdac3baad9ffd12b3b0bba4374d4b3585d54 (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < 13ea4f86cf738c74be2146886ac261988a631e62 (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5 (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa (affected, git) ≥ 0269ea4937343536ec7e85649932bc8c9686ea78; < 5feba91006ec92da57acc1cc2e34df623b98541e (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.30 (affected) ≥ 0; < 2.6.30 (unaffected, semver) ≥ 5.10.261; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557dCNA: Linux
- https://git.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9ccCNA: Linux
- https://git.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79eCNA: Linux
- https://git.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54CNA: Linux
- https://git.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62CNA: Linux
- https://git.kernel.org/stable/c/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5CNA: Linux
- https://git.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aaCNA: Linux
- https://git.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541eCNA: Linux
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