Ubuntu Security Notices USN-8170-1 USN-8170-1: Corosync vulnerabilities Publication date 13 April 2026 Overview Several security issues were fixed in Corosync. Releases 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages 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 ) 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 ) Update instructions After a standard system update you need to restart Corosync to make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 25.10 questing corosync – 3.1.9-2ubuntu1.1 24.04 LTS noble corosync – 3.1.7-1ubuntu3.2 22.04 LTS jammy corosync – 3.1.6-1ubuntu1.2 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-35092 CVE-2026-35091 CVE-2026-35092 CVE-2026-35091