CVE-2026-98278: Linux kernel · net: remove WARN_ON_ONCE() from the dev_fill_forward_path() loop check
Affects Linux kernelSource CVE Database V5
Not known to be exploited : upgrade to d8eb177632dacda28bc6130c2105afbf5b791eb0 or 150dba2c69e93302af24a0c868eebe4871e2e107 when convenient.
Data as of 26 Oct 2026, 12:55 UTC
Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in d8eb177632dacda28bc6130c2105afbf5b791eb0, 150dba2c69e93302af24a0c868eebe4871e2e107
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to d8eb177632dacda28bc6130c2105afbf5b791eb0 or 150dba2c69e93302af24a0c868eebe4871e2e107.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in the Linux kernel versions identified by commits d8eb177632dacda28bc6130c2105afbf5b791eb0 and 150dba2c69e93302af24a0c868eebe4871e2e107. Users should update to these fixed kernel versions to eliminate the warning and handle the routing loop condition gracefully.
Description
This vulnerability in the Linux kernel involves the removal of a WARN_ON_ONCE() warning from the dev_fill_forward_path() loop check. The issue arises when a routing loop is configured by a user with CAP_NET_ADMIN privileges, causing the dev_fill_forward_path() function to repeatedly encounter the same device and trigger a warning. The fix removes the warning and instead fails the walk gracefully, preventing unnecessary warnings during tunnel route resolution.