CVE-2026-98278 (GCVE-0-2026-98278)
Vulnerability from cvelistv5
Published
2026-10-06 08:45
Modified
2026-10-19 09:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check ipip_fill_forward_path() and ip6_tnl_fill_forward_path() look up the route to the tunnel's remote endpoint and set ctx->dev to its device, which is the tunnel itself when that route resolves back to the tunnel. dev_fill_forward_path() then makes no progress and trips WARN_ON_ONCE(last_dev == ctx->dev) as soon as a flowtable tries to offload a flow through the tunnel. That routing loop is a configuration any CAP_NET_ADMIN user can set up, and ip_tunnel_xmit() and ip6_tnl_xmit() already treat it as a tx error, so remove the warning and just fail the walk, as commit 008e7a7c293b ("net: remove WARN_ON_ONCE when accessing forward path array") did for the path stack overflow.
References
Impacted products
Vendor Product Version
Linux Linux Version: ab427db17885814069bae891834f20842f0ac3a4
Version: ab427db17885814069bae891834f20842f0ac3a4
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check\n\nipip_fill_forward_path() and ip6_tnl_fill_forward_path() look up the\nroute to the tunnel\u0027s remote endpoint and set ctx-\u003edev to its device,\nwhich is the tunnel itself when that route resolves back to the tunnel.\ndev_fill_forward_path() then makes no progress and trips\nWARN_ON_ONCE(last_dev == ctx-\u003edev) as soon as a flowtable tries to\noffload a flow through the tunnel. That routing loop is a configuration\nany CAP_NET_ADMIN user can set up, and ip_tunnel_xmit() and\nip6_tnl_xmit() already treat it as a tx error, so remove the warning and\njust fail the walk, as commit 008e7a7c293b (\"net: remove WARN_ON_ONCE\nwhen accessing forward path array\") did for the path stack overflow."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:16:49.865Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/d8eb177632dacda28bc6130c2105afbf5b791eb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/150dba2c69e93302af24a0c868eebe4871e2e107"
        }
      ],
      "title": "net: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98278",
    "datePublished": "2026-10-06T08:45:38.346Z",
    "dateReserved": "2026-09-25T10:25:14.334Z",
    "dateUpdated": "2026-10-19T09:16:49.865Z",
    "state": "PUBLISHED"
  },
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