# CVE-2026-64410: linux: In the Linux kernel, the following vulnerability has been resolved:  netfilter: flowtable: IPIP tunnel hardware offlo...

CVE-2026-64410 is fixed in linux on 1 platform by DEBIAN-CVE-2026-64410 (version 7.1.4-1), released August 7, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-64410
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0055
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 25, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.4-1 | [DEBIAN-CVE-2026-64410](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64410.md) | Aug 7, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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