netfilter: xt_cluster: reject template conntracks in hash match (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.22 % · percentile 12 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
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.
References
- https://git.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557d
- https://git.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9cc
- https://git.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79e
- https://git.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54
- https://git.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62
- https://git.kernel.org/stable/c/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5
- https://git.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa
- https://git.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541e
European references
- ENISA EUVD · EUVD-2026-59155
- GCVE · GCVE-0-2026-72256
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1372 — Multiples vulnérabilités dans les produits SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1335 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 0269ea4937343536ec7e85649932bc8c9686ea78 < 4558bd7b47c7be82dffd837f27be8ea3ecee557d ; affected 0269ea4937343536ec7e85649932bc8c9686ea78 < d5f9d050b0b267227c1f02f11021872c7768a9cc ; affected 0269ea4937343536ec7e85649932bc8c9686ea78 < 4cb8b5f586e41c187942291cc0938006077fa79e ; affected 0269ea4937343536ec7e85649932bc8c9686ea78 < fac2fdac3baad9ffd12b3b0bba4374d4b3585d54 ; affected 0269ea4937343536ec7e85649932bc8c9686ea78 < 13ea4f86cf738c74be2146886ac261988a631e62 ; affected 0269ea4937343536ec7e85649932bc8c9686ea78 < 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5 |
| Linux · Linux | affected 2.6.30 ; unaffected 0 < 2.6.30 ; unaffected 5.10.261 ≤ 5.10.* ; unaffected 5.15.212 ≤ 5.15.* ; unaffected 6.1.178 ≤ 6.1.* ; unaffected 6.6.145 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |