Bug 2525114 (CVE-2026-71402)

Summary: CVE-2026-71402 wicked: wicked: Information Disclosure via crafted DHCPv4 packets
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in wicked. An unauthenticated attacker on the same network who sends a crafted DHCP/UDP packet can trigger an out-of-bounds read vulnerability in the DHCPv4 option parser. This allows the client to parse adjacent heap memory as DHCP options, potentially leading to the disclosure of sensitive heap contents such as allocator metadata or pointer values into lease fields. The over-read is bounded to 68 bytes.
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Bug Depends On: 2526703    
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Description OSIDB Bzimport 2026-08-27 17:02:06 UTC 
An out-of-bounds read was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c reports the IP total length as the payload length instead of the length of the remaining UDP payload. Consequently, the DHCP option walker in the DHCPv4 client (wickedd-dhcp4) reads up to ihl + 8 bytes — at most 68 bytes — past the end of the 1500-byte packet receive buffer. An unauthenticated attacker on the same network who sends a crafted DHCP/UDP packet can make the client parse adjacent heap memory as DHCP options, so that heap contents such as allocator metadata or pointer values can be interpreted into lease fields. The over-read is bounded to 68 bytes; no memory write, no attacker control over the adjacent bytes and no remote exfiltration primitive has been demonstrated. This issue affects wicked up to and including version 0.6.80.