A vulnerability in the Linux kernel related to the use of WARN_ON_ONCE when accessing the forward path array has been resolved. (CVE-2026-45847)
A vulnerability in the Linux kernel related to the use of WARN_ON_ONCE when accessing the forward path array has been resolved. The issue involved a warning that could be triggered if userspace constructed a sufficiently long forward path, particularly with recent IPIP tunnel support. The warning was removed to address this unlikely but possible condition.
AI Analysis
Technical Summary
The Linux kernel contained a vulnerability (CVE-2026-45847) where the use of WARN_ON_ONCE during access to the forward path array could be triggered if userspace managed to build a sufficiently long forward path, especially with recent IPIP tunnel support. This warning could lead to a denial of service condition by causing kernel warnings. The vulnerability has been resolved by removing the WARN_ON_ONCE call, eliminating the potential for this warning to be triggered.
Potential Impact
The vulnerability does not affect confidentiality or integrity but can cause an availability impact by triggering kernel warnings that may lead to denial of service. The CVSS vector indicates local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no explicit patch or fix link is provided, users should monitor official Linux kernel advisories for updates addressing this issue.
A vulnerability in the Linux kernel related to the use of WARN_ON_ONCE when accessing the forward path array has been resolved. (CVE-2026-45847)
Description
A vulnerability in the Linux kernel related to the use of WARN_ON_ONCE when accessing the forward path array has been resolved. The issue involved a warning that could be triggered if userspace constructed a sufficiently long forward path, particularly with recent IPIP tunnel support. The warning was removed to address this unlikely but possible condition.
CVSS v3.1
Score 5.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel contained a vulnerability (CVE-2026-45847) where the use of WARN_ON_ONCE during access to the forward path array could be triggered if userspace managed to build a sufficiently long forward path, especially with recent IPIP tunnel support. This warning could lead to a denial of service condition by causing kernel warnings. The vulnerability has been resolved by removing the WARN_ON_ONCE call, eliminating the potential for this warning to be triggered.
Potential Impact
The vulnerability does not affect confidentiality or integrity but can cause an availability impact by triggering kernel warnings that may lead to denial of service. The CVSS vector indicates local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no explicit patch or fix link is provided, users should monitor official Linux kernel advisories for updates addressing this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-3538-rrcv-8mrq
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-45847"]
- Ecosystems
- []
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a3ef7f327e9c79719036ec4
Added to database: 06/26/2026, 22:06:43 UTC
Last enriched: 06/26/2026, 22:52:43 UTC
Last updated: 07/31/2026, 19:44:28 UTC
Views: 53
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