CVE-2026-98278net: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ab427db17885814069bae891834f20842f0ac3a4 before d8eb177632dacda28bc6130c2105afbf5b791eb0; from ab427db17885814069bae891834f20842f0ac3a4 before 150dba2c69e93302af24a0c868eebe4871e2e107 | CNA record |
References
- https://git.kernel.org/stable/c/d8eb177632dacda28bc6130c2105afbf5b791eb0
- https://git.kernel.org/stable/c/150dba2c69e93302af24a0c868eebe4871e2e107
The CVE record on cve.org NVD's entry
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