CVE-2026-71401
Severity CVSS v4.0:
MEDIUM
Type:
CWE-191
Integer Underflow (Wrap or Wraparound)
Publication date:
27/08/2026
Last modified:
27/08/2026
Description
An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.
Impact
Base Score 4.0
5.30
Severity 4.0
MEDIUM