CVE-2026-81665 Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly

A heap-based buffer overflow was found in Corosync's Totem Process Group totempg message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast...

CVE-2026-81665

Corosync's Totem Process Group (totempg) suffers from a heap-based buffer overflow in its fragmented multicast message reassembly path. In release builds, the reassembly buffer lacks a runtime bounds check, allowing a network-adjacent attacker to send crafted multicast protocol messages that over...