CVE-2026-72256
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.
How to fix
- Linux Linux4558bd7b47c7be82dffd837f27be8ea3ecee557d, d5f9d050b0b267227c1f02f11021872c7768a9cc, 4cb8b5f586e41c187942291cc0938006077fa79e, fac2fdac3baad9ffd12b3b0bba4374d4b3585d54, 13ea4f86cf738c74be2146886ac261988a631e62, 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5, 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa, 5feba91006ec92da57acc1cc2e34df623b98541e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < 4558bd7b47c7be82dffd837f27be8ea3ecee557d, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < d5f9d050b0b267227c1f02f11021872c7768a9cc, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < 4cb8b5f586e41c187942291cc0938006077fa79e, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < fac2fdac3baad9ffd12b3b0bba4374d4b3585d54, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < 13ea4f86cf738c74be2146886ac261988a631e62, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa, 0269ea4937343536ec7e85649932bc8c9686ea78 ≤ v < 5feba91006ec92da57acc1cc2e34df623b98541e, 2.6.30 | 4558bd7b47c7be82dffd837f27be8ea3ecee557d, d5f9d050b0b267227c1f02f11021872c7768a9cc, 4cb8b5f586e41c187942291cc0938006077fa79e, fac2fdac3baad9ffd12b3b0bba4374d4b3585d54, 13ea4f86cf738c74be2146886ac261988a631e62, 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5, 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa, 5feba91006ec92da57acc1cc2e34df623b98541e |
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