CVE-2026-56116

Summary

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.

Affected Software

VendorProductVersion RangeStatus
NetworkConfigurationdhcpcd10.0.7 <= 10.3.2affected
NetworkConfigurationdhcpcd708b4a56bae080a5b18c2e0c4c6fbe103131a2b0unaffected

Weaknesses

  • CWE-401: Missing Release of Memory after Effective Lifetime

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References