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Ubuntu 25.10 Corosync Faces Critical DoS Vulnerability 2026-35091

ubuntu
Calendar Grey April 13, 2026
Dist Ubuntu Esm H88
Critical security flaws in Corosync for Ubuntu can lead to service disruptions and exposure of sensitive data.
Several security issues were fixed in Corosync.

Summary

Several security issues were fixed in Corosync.

Software Description:

- corosync: cluster engine daemon and utilities

Details:

It was discovered that Corosync incorrectly handled the membership commit

token validity check. A remote attacker could use this issue to cause

Corosync to crash, resulting in a denial of service, or to possibly obtain

a small quantity of sensitive information. (CVE-2026-35091)

It was discovered that Corosync incorrectly handled join message

validation. A remote attacker could possibly use this issue to cause

Corosync to crash, resulting in a denial of service. (CVE-2026-35092)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu corosync membership issue

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  corosync                        3.1.9-2ubuntu1.1

Ubuntu 24.04 LTS
  corosync                        3.1.7-1ubuntu3.2

Ubuntu 22.04 LTS
  corosync                        3.1.6-1ubuntu1.2

After a standard system update you need to restart Corosync to make all the
necessary changes.

References

https://ubuntu.com/security/notices/USN-8170-1

CVE-2026-35091, CVE-2026-35092

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8170-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu corosync membership issue

Package Information

https://launchpad.net/ubuntu/+source/corosync/3.1.9-2ubuntu1.1
https://launchpad.net/ubuntu/+source/corosync/3.1.7-1ubuntu3.2
https://launchpad.net/ubuntu/+source/corosync/3.1.6-1ubuntu1.2

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