CVE-2026-71401: CWE-191 Integer underflow (wrap or wraparound) in SUSE wicked
Description
CVE-2026-71401 is an integer underflow vulnerability in the DHCPv4 packet capture code of SUSE wicked. The function ni_capture_inspect_udp_header() does not properly verify that the IP total length is at least as large as the IP header length before performing a subtraction, leading to an out-of-bounds read. An unauthenticated attacker on the same network can exploit this to crash the wicked DHCPv4 client daemon. No information disclosure or other impacts have been demonstrated. This affects wicked versions up to and including 0.6.80.
CVSS v4.0
Score 5.3medium
Affected software
SUSE
wicked
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An integer underflow occurs in wicked's DHCPv4 packet capture code (ni_capture_inspect_udp_header in src/capture.c) due to missing validation that the IP total length field (ip_len) is at least the IP header length (ihl) before subtracting ihl. This can cause an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), potentially crashing the daemon depending on memory layout. The vulnerability requires network proximity and no privileges or user interaction. No evidence of information disclosure or other impacts is reported. The issue affects wicked versions up to and including 0.6.80.
Potential Impact
An unauthenticated attacker on the same network can cause the wicked DHCPv4 client daemon to crash by sending specially crafted DHCPv4 packets that trigger an out-of-bounds read due to integer underflow. This results in a denial of service condition. No information disclosure or privilege escalation has been demonstrated.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network administrators should consider limiting exposure of the wicked DHCPv4 client to untrusted networks. Monitor for daemon crashes and restart the service as needed.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-08-06T11:38:54.896Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a906badacd9273b49839ac6
Added to database: 08/27/2026, 16:54:05 UTC
Last enriched: 09/10/2026, 04:39:16 UTC
Last updated: 10/09/2026, 18:48:22 UTC
Views: 49
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