netfilter: xt_CT: drop pending enqueued packets on template removal
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy, nfnetlink_cttimeout might remove it. The use of templates with zone and event cache filter are safe, since this just copies values. Flush these enqueued packets in case the template rule gets removed.
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy, nfnetlink_cttimeout might remove it. The use of templates with zone and event cache filter are safe, since this just copies values. Flush these enqueued packets in case the template rule gets removed.
05 / REFERENCES
Further evidence
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9
- https://git.kernel.org/stable/c/55445134d42b84cb0a272e42c98d233ca65eca83
- https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec
- https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325
- https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c
- https://git.kernel.org/stable/c/cc57506dd66555899560b9c0f24e813f034e12ec
- https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6990a2966f5cdce0813d6256
- https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23391.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-23391