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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-81665

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

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Status
Published
Published
Updated
Assigning organization
redhat

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Red Hat Red Hat Enterprise Linux 10

Default version status: affected

  • 0:3.1.10-1.el10_2.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

Default version status: affected

  • 0:3.1.9-1.el10_0.3 to < *unaffected

Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

Default version status: affected

  • 0:2.4.5-7.el7_9.4 to < *unaffected

Red Hat Red Hat Enterprise Linux 8

Default version status: affected

  • 0:3.1.8-1.el8_10.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Default version status: affected

  • 0:3.1.0-3.el8_4.3 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Default version status: affected

  • 0:3.1.0-3.el8_4.3 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Default version status: affected

  • 0:3.1.5-2.el8_6.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Default version status: affected

  • 0:3.1.5-2.el8_6.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Default version status: affected

  • 0:3.1.7-1.el8_8.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Default version status: affected

  • 0:3.1.7-1.el8_8.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 9

Default version status: affected

  • 0:3.1.10-1.el9_8.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Default version status: affected

  • 0:3.1.7-1.el9_2.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Default version status: affected

  • 0:3.1.8-1.el9_4.2 to < *unaffected

Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support

Default version status: affected

  • 0:3.1.9-2.el9_6.2 to < *unaffected

Red Hat Red Hat OpenShift Container Platform 4

Default version status: affected

Red Hat Red Hat OpenShift Container Platform 4

Default version status: unaffected

References