{"id":"CVE-2026-98278","title":"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's remot…","summary":"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's remot…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= ab427db17885814069bae891834f20842f0ac3a4 < d8eb177632dacda28bc6130c2105afbf5b791eb0","Linux >= ab427db17885814069bae891834f20842f0ac3a4 < 150dba2c69e93302af24a0c868eebe4871e2e107","Linux 6.19"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T09:18:17.660","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98278","references":[{"url":"https://git.kernel.org/stable/c/150dba2c69e93302af24a0c868eebe4871e2e107","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d8eb177632dacda28bc6130c2105afbf5b791eb0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98278.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98278"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546540"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98278"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98278"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98278.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-06T08:50:17.422Z","epss":0.00172,"epssPercentile":0.06524,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-617"],"slug":"CVE-2026-98278","body":"## Overview\n\nIn 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's remote endpoint and set ctx->dev 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->dev) 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98278.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224129,"id":"CVE-2026-98278","ts":1792324939639,"field":"cvss","old":null,"new":"5.5"},{"seq":224128,"id":"CVE-2026-98278","ts":1792324939639,"field":"severity","old":"none","new":"medium"}]}