Linux Kernel: netfilter xt_CT drop pending packets on template removal
CVE-2026-23391 Published on March 25, 2026
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.
Products Associated with CVE-2026-23391
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Affected Versions
Linux:- Version 24de58f465165298aaa8f286b2592f0163706cfe and below d2d0bae0c9a2a17b6990a2966f5cdce0813d6256 is affected.
- Version 24de58f465165298aaa8f286b2592f0163706cfe and below 63b8097cea1923fe82cd598068d0796da8c015ec is affected.
- Version 24de58f465165298aaa8f286b2592f0163706cfe and below 19a230dec6bb8928e3f96387f9085cf2c79bcef9 is affected.
- Version 24de58f465165298aaa8f286b2592f0163706cfe and below cb549925875fa06dd155e49db4ac2c5044c30f9c is affected.
- Version 24de58f465165298aaa8f286b2592f0163706cfe and below 777d02efe3d630cca4c1b63962cec17c57711325 is affected.
- Version 24de58f465165298aaa8f286b2592f0163706cfe and below f62a218a946b19bb59abdd5361da85fa4606b96b is affected.
- Version 3.4 is affected.
- Before 3.4 is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.20, <= 6.18.* is unaffected.
- Version 6.19.10, <= 6.19.* is unaffected.
- Version 7.0-rc5, <= * is unaffected.