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CVE-2026-81665

7.5 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 5

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 20:43
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-21 21:19
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 17:51
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-21 18:17
  5. First seenCVSS 7.5 · red hatNVD modified 2026-10-21 17:51

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 13