CVE-2026-35091
Publication date 1 April 2026
Last updated 13 April 2026
Ubuntu priority
Description
A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents. This vulnerability affects Corosync when running in totemudp/totemudpu mode, which is the default configuration.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| corosync | 25.10 questing |
Fixed 3.1.9-2ubuntu1.1
|
| 24.04 LTS noble |
Fixed 3.1.7-1ubuntu3.2
|
|
| 22.04 LTS jammy |
Fixed 3.1.6-1ubuntu1.2
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.2 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-8170-1
- Corosync vulnerabilities
- 13 April 2026