CVE-2026-45847

Analyzed Analyzed - Analysis Complete

Linux Kernel Forward Path Array Access Warning Removal

Publication date: 2026-05-27

Last updated on: 2026-06-25

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE when accessing forward path array Although unlikely, recent support for IPIP tunnels increases chances of reaching this WARN_ON_ONCE if userspace manages to build a sufficiently long forward path. Remove it.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-27

Last Modified

2026-06-25

Generated

2026-07-07

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-45847

EUVD

EUVD-2026-32313

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.13 (inc) to 6.18.14 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.4 (exc)
linux	linux_kernel	From 6.2 (inc) to 6.6.128 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.75 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.165 (exc)
linux	linux_kernel	From 5.13 (inc) to 5.15.202 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-617	The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Attack-Flow Graph

Impact Analysis

The vulnerability is unlikely to have a significant impact since it mainly involves a warning being triggered in the kernel when accessing the forward path array under specific conditions involving IPIP tunnels.

If triggered, it could potentially cause unnecessary warnings or disruptions in kernel operation, but no direct security impact or exploitation details are provided.

Executive Summary

This vulnerability relates to the Linux kernel where a warning mechanism called WARN_ON_ONCE was triggered when accessing the forward path array. The issue arises particularly with recent support for IPIP tunnels, which can increase the chances of triggering this warning if userspace constructs a sufficiently long forward path.

The vulnerability was addressed by removing the WARN_ON_ONCE check to prevent this warning from occurring.

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