SUSE-SU-2026:4387-1: important: Security update for corosync

[SLE-UPDATES]

# Security update for corosync

Announcement ID: SUSE-SU-2026:4387-1  
Release Date: 2026-09-29T11:44:07Z  
Rating: important  
References:

  * bsc#1278738

  
Cross-References:

  * CVE-2026-81665

  
CVSS scores:

  * CVE-2026-81665 ( SUSE ):  7.7
    CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-81665 ( SUSE ):  7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-81665 ( NVD ):  7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Enterprise High Availability Extension 12 SP5
  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server 12 SP5 LTSS
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for corosync fixes the following issue:

  * CVE-2026-81665: heap-based buffer overflow in totempg assembly buffer during
    fragmented message reassembly (bsc#1278738).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server for SAP Applications 12 SP5  
    zypper in -t patch SUSE-SLE-HA-12-SP5-2026-4387

  * SUSE Linux Enterprise High Availability Extension 12 SP5  
    zypper in -t patch SUSE-SLE-HA-12-SP5-2026-4387

  * SUSE Linux Enterprise Server 12 SP5 LTSS  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-4387

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-4387

## Package List:

  * SUSE Linux Enterprise Server for SAP Applications 12 SP5 (ppc64le x86_64)
    * corosync-debuginfo-2.3.6-9.25.1
    * libcorosync4-2.3.6-9.25.1
    * corosync-debugsource-2.3.6-9.25.1
    * libcorosync4-debuginfo-2.3.6-9.25.1
    * corosync-2.3.6-9.25.1
  * SUSE Linux Enterprise High Availability Extension 12 SP5 (ppc64le s390x
    x86_64)
    * corosync-debuginfo-2.3.6-9.25.1
    * libcorosync4-2.3.6-9.25.1
    * corosync-debugsource-2.3.6-9.25.1
    * libcorosync4-debuginfo-2.3.6-9.25.1
    * corosync-2.3.6-9.25.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
    * libcorosync-devel-2.3.6-9.25.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * libcorosync-devel-2.3.6-9.25.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-81665.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1278738

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