CVE-2026-72249

Received Received - Intake

Linux Kernel Netfilter Flowtable IPIP Header Push Vulnerability

Publication date: 2026-08-15

Last updated on: 2026-08-17

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: use dst in this direction when pushing IPIP header When pushing the IPIP header, the route of the other direction is used to calculate the headroom, use the route in this direction. Accessing the other tuple to set the IP source and destination is fine because this tuple does not provide such information to avoid storing redundant information. However, this tuple already provides the dst for this direction, this went unnoticed because this bug affects headroom and iph->frag_off only at this stage.

CVSS Scores

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Meta Information

Published

2026-08-15

Last Modified

2026-08-17

Generated

2026-09-04

AI Q&A

2026-08-15

EPSS Evaluated

2026-09-03

NVD

CVE-2026-72249

EUVD

EUVD-2026-59148

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves incorrect route usage when pushing an IPIP header in the netfilter flowtable. Instead of using the route in the current direction, the route from the opposite direction is used to calculate headroom. This bug affects headroom and fragment offset fields but does not impact IP source and destination settings.

Detection Guidance

This vulnerability is specific to the Linux kernel's netfilter flowtable functionality and involves incorrect route handling when pushing IPIP headers. Detection would require checking kernel logs for flowtable-related errors or examining kernel source code for the described issue. No direct commands are provided in the context to detect this vulnerability.

Impact Analysis

This vulnerability may cause network packet handling issues, potentially leading to incorrect routing, packet loss, or fragmentation problems. It could disrupt network traffic flow but does not directly expose systems to remote attacks or data breaches.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel networking issue related to flowtable handling, which does not involve data privacy, security controls, or protected health information.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. Monitor official Linux kernel security advisories for patches and apply them promptly.

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