CVE-2026-64410 (GCVE-0-2026-64410)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-27 05:00
VLAI
Title
netfilter: flowtable: IPIP tunnel hardware offload is not yet support
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ab427db17885814069bae891834f20842f0ac3a4 , < 9efe838c13133acb70c78d04c49e8362fe533566 (git)
Affected: ab427db17885814069bae891834f20842f0ac3a4 , < 6c5dcab95f4cd42a1648739ec9300fbb4b1a021f (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_flow_table.h",
            "net/netfilter/nf_flow_table_core.c",
            "net/netfilter/nf_flow_table_offload.c"
          ],
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: IPIP tunnel hardware offload is not yet support\n\nNo driver supports for IPIP tunnels yet, give up early on setting up the\nhardware offload for this scenario.\n\nThis patch adds a stub that can be enhanced to add more configuration\nthat are currently not supported. As of now, the offload work is\nenqueued to the worker, then ignored if the hardware offload\nconfiguration is not supported.\n\nCheck the NF_FLOW_HW flag to know if this entry was already tried once\nto be offloaded so this is not retried on refresh when unsupported. Move\nNF_FLOW_HW flag check to nf_flow_offload_add(). If this NF_FLOW_HW flag\nis unset the _del and _stats variants are never called.\n\nThis can be updated later on to skip hardware offload work to be queued\nin case hardware offload does not support it."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-07-27T05:00:40.745Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6c5dcab95f4cd42a1648739ec9300fbb4b1a021f"
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      "title": "netfilter: flowtable: IPIP tunnel hardware offload is not yet support",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64410",
    "datePublished": "2026-07-25T08:50:51.377Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-07-27T05:00:40.745Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-29T13:28:10+00:00",
      "cve": "CVE-2026-64410",
      "id": "CVE-2026-64410",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: flowtable: IPIP tunnel hardware offload is not yet support",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64410.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:52Z",
      "cve": "CVE-2026-64410",
      "id": "CVE-2026-64410",
      "initial_release_date": "2026-07-25T15:59:52Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64410",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64410.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.