CVE-2026-72256None▾ SunlitIn 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 t…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < 4558bd7b47c7be82dffd837f27be8ea3ecee557dLinux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < d5f9d050b0b267227c1f02f11021872c7768a9ccLinux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < 4cb8b5f586e41c187942291cc0938006077fa79eLinux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < fac2fdac3baad9ffd12b3b0bba4374d4b3585d54Linux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < 13ea4f86cf738c74be2146886ac261988a631e62Linux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5Linux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aaLinux >= 0269ea4937343536ec7e85649932bc8c9686ea78 < 5feba91006ec92da57acc1cc2e34df623b98541eLinux 2.6.30Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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