CVE-2026-56116 — dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling
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 s…
Published: 2026-06-23 · CVSS: 7.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7