Bug 2525114 (CVE-2026-71402) - CVE-2026-71402 wicked: wicked: Information Disclosure via crafted DHCPv4 packets
Summary: CVE-2026-71402 wicked: wicked: Information Disclosure via crafted DHCPv4 packets
Keywords:
Status: NEW
Alias: CVE-2026-71402
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2526703
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-27 17:02 UTC by OSIDB Bzimport
Modified: 2026-09-01 08:42 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
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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.


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