CVE-2026-72256

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-72256
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72256.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-72256
Downstream
Published
2026-08-15T05:54:43.706Z
Modified
2026-08-16T03:48:38.857138498Z
Summary
netfilter: xt_cluster: reject template conntracks in hash match
Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: xt_cluster: reject template conntracks in hash match

xtclustermt() treats any non-NULL nfctget() result as a fully initialized conntrack and passes it to xtclusterhash().

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 IPSTEMPLATE status but do not have a valid tuple for hashing yet, so xtclusterhash() 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72256.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0269ea4937343536ec7e85649932bc8c9686ea78
Fixed
4558bd7b47c7be82dffd837f27be8ea3ecee557d
Fixed
d5f9d050b0b267227c1f02f11021872c7768a9cc
Fixed
4cb8b5f586e41c187942291cc0938006077fa79e
Fixed
fac2fdac3baad9ffd12b3b0bba4374d4b3585d54
Fixed
13ea4f86cf738c74be2146886ac261988a631e62
Fixed
07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5
Fixed
5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa
Fixed
5feba91006ec92da57acc1cc2e34df623b98541e

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72256.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.30
Fixed
5.10.261
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.212
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.178
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.145
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.97
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.40
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72256.json"