CVE-2026-72256netfilter: xt_cluster: reject template conntracks in hash match
- —Not scoredno CVSS score yet
- 0.22%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < 4558bd7b47c7be82dffd837f27be8ea3ecee557d
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < d5f9d050b0b267227c1f02f11021872c7768a9cc
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < 4cb8b5f586e41c187942291cc0938006077fa79e
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < fac2fdac3baad9ffd12b3b0bba4374d4b3585d54
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < 13ea4f86cf738c74be2146886ac261988a631e62
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa
- affected 0269ea4937343536ec7e85649932bc8c9686ea78 – < 5feba91006ec92da57acc1cc2e34df623b98541e
- affected 2.6.30
- unaffected < 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.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/4558bd7b47c7be82dffd837f27be8ea3ecee557d (opens in a new tab)
- https://git.kernel.org/stable/c/d5f9d050b0b267227c1f02f11021872c7768a9cc (opens in a new tab)
- https://git.kernel.org/stable/c/4cb8b5f586e41c187942291cc0938006077fa79e (opens in a new tab)
- https://git.kernel.org/stable/c/fac2fdac3baad9ffd12b3b0bba4374d4b3585d54 (opens in a new tab)
- https://git.kernel.org/stable/c/13ea4f86cf738c74be2146886ac261988a631e62 (opens in a new tab)
- https://git.kernel.org/stable/c/07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5 (opens in a new tab)
- https://git.kernel.org/stable/c/5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa (opens in a new tab)
- https://git.kernel.org/stable/c/5feba91006ec92da57acc1cc2e34df623b98541e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59155 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-72256)Record last updated .