CVE-2026-0619: Silicon Labs Matter SDK DoS Vulnerability

CVE-2026-0619 Overview

A reachable infinite loop vulnerability caused by an integer wraparound has been identified in Silicon Labs' Matter SDK. This vulnerability allows an attacker to trigger a denial of service condition on affected IoT devices. The attack renders the device unresponsive, requiring a hard reset to restore normal operation.

Critical Impact

Attackers can remotely trigger an infinite loop condition that crashes Matter-enabled IoT devices, requiring physical intervention (hard reset) to recover functionality.

Affected Products

• Silicon Labs Matter SDK

Discovery Timeline

• 2026-02-12 - CVE-2026-0619 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-0619

Vulnerability Analysis

This vulnerability stems from CWE-190 (Integer Overflow or Wraparound), where an arithmetic operation produces a result that exceeds the maximum value representable by the integer type. When an integer wraparound occurs in the Silicon Labs Matter SDK, the affected calculation produces an unexpectedly small value that leads to an infinite loop condition.

The network-accessible nature of this vulnerability means that remote attackers can exploit it without physical access to the target device. However, some attack prerequisites exist, such as the need for low-level privileges to interact with the vulnerable component.

The primary impact is availability disruption. The infinite loop consumes processing resources and prevents the device from performing its intended functions. Unlike typical DoS conditions that may self-recover, this vulnerability requires manual intervention through a hard reset, increasing the operational burden on device owners and administrators.

Root Cause

The root cause is an integer wraparound condition (CWE-190) in the Matter SDK's processing logic. When specific input values are provided, an arithmetic operation produces a result that wraps around the maximum integer boundary, resulting in an unexpectedly small or negative value. This corrupted value then causes loop termination conditions to never be satisfied, creating an infinite loop that hangs the device.

Attack Vector

The attack is network-based, allowing remote exploitation. An authenticated attacker with low privileges can send specially crafted input to trigger the integer wraparound condition. The attack requires certain preconditions to be met but does not require user interaction.

The exploitation flow involves:

1. The attacker identifies a Matter-enabled device running the vulnerable SDK version
2. The attacker sends specially crafted network requests containing values designed to trigger the integer wraparound
3. The wraparound causes loop control variables to malfunction
4. The device enters an infinite loop and becomes unresponsive
5. Recovery requires physical access to perform a hard reset

For technical implementation details, refer to the Silicon Labs Community Post.

Detection Methods for CVE-2026-0619

Indicators of Compromise

• Device becomes unresponsive to network requests or local controls
• Matter protocol communication failures with specific devices
• Repeated device resets or power cycles required to restore functionality
• Unusual network traffic patterns targeting Matter protocol endpoints

Detection Strategies

• Monitor for sudden loss of heartbeat or keep-alive signals from Matter-enabled devices
• Implement network traffic analysis to detect malformed or oversized integer values in Matter protocol communications
• Deploy endpoint monitoring on IoT management platforms to track device availability
• Establish baseline behavior patterns and alert on devices requiring frequent hard resets

Monitoring Recommendations

• Configure SNMP or equivalent monitoring for IoT device availability
• Implement automated alerting when Matter devices fail health checks
• Log and analyze all network traffic to Matter-enabled endpoints for anomalous patterns
• Deploy SentinelOne Singularity™ for IoT to gain visibility into connected device behavior

How to Mitigate CVE-2026-0619

Immediate Actions Required

• Review the Silicon Labs Community Post for vendor guidance and available patches
• Inventory all devices running Silicon Labs Matter SDK to determine exposure
• Implement network segmentation to isolate Matter-enabled IoT devices from untrusted networks
• Restrict network access to Matter protocol ports to trusted sources only

Patch Information

Silicon Labs has published information regarding this vulnerability. Administrators should consult the Silicon Labs Community Post for the latest patch information and updated SDK versions. Apply vendor-provided firmware updates as they become available.

Workarounds

• Implement firewall rules to restrict access to Matter protocol communications from untrusted networks
• Deploy network-level rate limiting to reduce the impact of potential exploitation attempts
• Consider temporarily disabling network accessibility for non-critical Matter devices until patches are applied
• Enable logging on network boundaries to detect and investigate suspicious traffic patterns

# Example: Network segmentation for Matter devices
# Restrict Matter protocol access to trusted management networks
iptables -A INPUT -p tcp --dport 5540 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 5540 -j DROP
iptables -A INPUT -p udp --dport 5540 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p udp --dport 5540 -j DROP