CVE-2026-23391: netfilter: xt_CT: drop pending enqueued packets on template removal
In the Linux kernel, the following vulnerability has been resolved:
netfilter: xtCT: 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, nfnetlinkcttimeout 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23391?
CVE-2026-23391 is classified as a medium severity vulnerability affecting the Linux netfilter xt_CT component.
How do I fix CVE-2026-23391?
To fix CVE-2026-23391, you should update the Linux kernel to the latest version that contains the relevant patch.
What systems are affected by CVE-2026-23391?
CVE-2026-23391 affects systems running the Linux kernel with the netfilter xt_CT module.
What does CVE-2026-23391 impact in network operations?
CVE-2026-23391 impacts network packet handling by dropping pending enqueued packets during template removal in the netfilter subsystem.
Is there any workaround for CVE-2026-23391?
There are no known workarounds for CVE-2026-23391, and updating the kernel is recommended to mitigate the vulnerability.