The IPv6 Neighbor Discovery handlers in subsys/net/ip/ipv6_nbr
Description
The IPv6 Neighbor Discovery handlers in subsys/net/ip/ipv6_nbr
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
---METADATA---
VENDOR: Zephyr Project
PRODUCT: Zephyr RTOS
AFFECTED_VERSIONS: See vendor advisory for specific affected versions
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Description Summary:
The IPv6 Neighbor Discovery handlers in the Zephyr RTOS contain a vulnerability that may lead to memory corruption or instability.
Executive Summary:
A critical vulnerability in the Zephyr RTOS IPv6 stack could allow for remote memory corruption, potentially leading to unauthorized code execution or system crashes.
Vulnerability Details
CVE-ID: CVE-2026-7656
Affected Software: Zephyr Project Zephyr
Affected Versions: See vendor advisory for specific affected versions
Vulnerability: This vulnerability resides in the IPv6 Neighbor Discovery handlers within the networking subsystem. It involves improper handling of packet data, which can be exploited by an unauthenticated remote attacker via crafted IPv6 traffic.
Business Impact
With a CVSS score of 8.1, this vulnerability poses a severe risk to embedded systems and IoT devices running Zephyr. Exploitation could allow attackers to bypass security boundaries, crash critical infrastructure, or achieve remote code execution, leading to full device compromise.
Remediation Plan
Immediate Action: Update the Zephyr RTOS codebase to the latest version incorporating the fix for the IPv6 Neighbor Discovery handler vulnerability.
Proactive Monitoring: Monitor network traffic for malformed IPv6 Neighbor Discovery packets or unusual protocol behavior within the network stack.
Compensating Controls: If patching is not immediately feasible, restrict inbound IPv6 traffic to only known, trusted sources and utilize internal network segmentation to isolate vulnerable devices.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of June 30, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.
Analyst Recommendation
Embedded systems are often difficult to patch, but the risk associated with this network-level vulnerability is significant. Organizations must prioritize updating their Zephyr-based firmware to prevent potential remote exploitation of their connected devices.