CVE-2026-64410: netfilter: flowtable: IPIP tunnel hardware offload is not yet support
In the Linux kernel, the following vulnerability has been resolved:
netfilter: flowtable: IPIP tunnel hardware offload is not yet support
No driver supports for IPIP tunnels yet, give up early on setting up the hardware offload for this scenario.
This patch adds a stub that can be enhanced to add more configuration that are currently not supported. As of now, the offload work is enqueued to the worker, then ignored if the hardware offload configuration is not supported.
Check the NFFLOWHW flag to know if this entry was already tried once to be offloaded so this is not retried on refresh when unsupported. Move NFFLOWHW flag check to nfflowoffloadadd(). If this NFFLOWHW flag is unset the del and stats variants are never called.
This can be updated later on to skip hardware offload work to be queued in case hardware offload does not support it.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64410?
The severity of CVE-2026-64410 is critical with a CVSS score of 9.8.
How do I fix CVE-2026-64410?
To address CVE-2026-64410, ensure you update to a patched version of the Linux kernel that resolves this vulnerability.
What impact does CVE-2026-64410 have on my system?
CVE-2026-64410 may impact your system by preventing IPIP tunnel hardware offload, potentially affecting performance.
When was CVE-2026-64410 published?
CVE-2026-64410 was published on July 25, 2026.
Which software is affected by CVE-2026-64410?
CVE-2026-64410 affects the Linux kernel.