SUSE-SU-2026:23850-1: important: Security update for corosync

[SLE-SECURITY-UPDATES]

# Security update for corosync

Announcement ID: SUSE-SU-2026:23850-1  
Release Date: 2026-09-20T04:53:53Z  
Rating: important  
References:

  * bsc#1278738
  * bsc#1278739

  
Cross-References:

  * CVE-2026-81665
  * CVE-2026-81666

  
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
  * CVE-2026-81666 ( SUSE ):  7.1
    CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-81666 ( SUSE ):  6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-81666 ( NVD ):  6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server High Availability Extension 16.0

  
  
An update that solves two vulnerabilities can now be installed.

## Description:

This update for corosync fixes the following issues:

  * CVE-2026-81665: heap-based buffer overflow in totempg assembly buffer during
    fragmented message reassembly (bsc#1278738).
  * CVE-2026-81666: integer overflow in check_memb_commit_token_sanity may
    bypass message length validation on 32-bit systems (bsc#1278739).

## 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 High Availability Extension 16.0  
    zypper in -t patch SUSE-SLES-HA-16.0-1714

## Package List:

  * SUSE Linux Enterprise Server High Availability Extension 16.0 (ppc64le s390x
    x86_64)
    * corosync-libs-3.1.9-160000.4.1
    * corosync-devel-3.1.9-160000.4.1
    * corosync-debuginfo-3.1.9-160000.4.1
    * corosync-libs-debuginfo-3.1.9-160000.4.1
    * corosync-3.1.9-160000.4.1
    * corosync-debugsource-3.1.9-160000.4.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-81665.html
  * https://www.suse.com/security/cve/CVE-2026-81666.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1278738
  * https://bugzilla.suse.com/show_bug.cgi?id=1278739

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