DEBIAN-CVE-2026-81665
Dashboard / Vulnerabilities / DEBIAN-CVE-2026-81665
Summary:
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.
Affected packages
Package
Name: corosync
Purl: pkg:deb/debian/corosync?arch=source&distro=bookworm
Affected ranges
Type: ECOSYSTEM
Events:
Introduced- 0
Fixed -None
Affected versions
3.1.10-1
3.1.10-2
3.1.10-3
3.1.10-4
3.1.7-1
3.1.7-1+deb12u1
3.1.7-1+deb12u2
3.1.8-1
3.1.8-2
3.1.8-3
3.1.9-1
3.1.9-2
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
