CVE-2026-64410
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
In the Linux kernel netfilter flowtable subsystem, hardware offload for IPIP tunnels is not yet supported. Despite this, offload attempts are queued to a worker and then ignored, causing unnecessary overhead. The patch adds early checking and bail-out for IPIP tunnel offload.
Risk Assessment
Unsupported hardware offload configurations can lead to unnecessary system overhead and potentially cause flowtable misbehavior.
Recommendation
Apply the Linux kernel patch that early bails out of hardware offload attempts for IPIP tunnels to avoid unnecessary overhead.
Original NVD description (English source)
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 NF_FLOW_HW flag to know if this entry was already tried once to be offloaded so this is not retried on refresh when unsupported. Move NF_FLOW_HW flag check to nf_flow_offload_add(). If this NF_FLOW_HW 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.