CVE-2026-98278 (GCVE-0-2026-98278)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45
VLAI
Title
net: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6664 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ab427db17885814069bae891834f20842f0ac3a4 , < d8eb177632dacda28bc6130c2105afbf5b791eb0 (git)
Affected: ab427db17885814069bae891834f20842f0ac3a4 , < 150dba2c69e93302af24a0c868eebe4871e2e107 (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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        }
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      "providerMetadata": {
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    "datePublished": "2026-10-06T08:45:38.346Z",
    "dateReserved": "2026-09-25T10:25:14.334Z",
    "dateUpdated": "2026-10-06T08:45:38.346Z",
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            "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."
          }
        ],
        "id": "CVE-2026-98278",
        "lastModified": "2026-10-06T09:18:17.660",
        "metrics": {},
        "published": "2026-10-06T09:18:17.660",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "cve": "CVE-2026-98278",
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      "product_status:known_affected": "91",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98278.json",
      "version": "3"
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}



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