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Vulnerability record · CVE-2026-23391 · published 25 March 2026

CVE-2026-23391: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9%
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
14 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9 Patch
https://git.kernel.org/stable/c/55445134d42b84cb0a272e42c98d233ca65eca83 Patch
https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec Patch
https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325 Patch
https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c Patch
https://git.kernel.org/stable/c/cc57506dd66555899560b9c0f24e813f034e12ec Patch
https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6990a2966f5cdce0813d6256 Patch
https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2026-23391), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.