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.

https://git.kernel.org/stable/c/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5

https://git.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62

https://git.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557d

https://git.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79e

https://git.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa

https://git.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541e

https://git.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9cc

https://git.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54

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