PT-2026-51565 · Networkconfiguration · Dhcpcd

Cub3Y0Nd + 1 · Published 2026-06-23 · Updated 2026-06-23 · CVE-2026-56116

Mitre

CVSS v3.1

6.5

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo findalloc() that cause linear memory exhaustion and eventual daemon crash.

Fix

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

CVE-2026-56116

Affected Products

Dhcpcd

References · 3

• https://github.com/NetworkConfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-56116 · Security Note
• https://vulncheck.com/advisories/dhcpcd-memory-leak-dos-via-ipv6-router-advertisement-handling · Note