AZL-99888

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AZL-99888

Summary: CVE-2026-81665 affecting package corosync 3.0.4-4

Details: 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 protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.

References: https://nvd.nist.gov/vuln/detail/CVE-2026-81665