Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
4DescriptionCVE.org
A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets. This can cause the service to crash, leading to a denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode.
AnalysisAI
Remote denial of service via integer overflow in Corosync cluster engine affects Red Hat Enterprise Linux 7-10 and OpenShift Container Platform 4. Unauthenticated attackers can send crafted UDP packets to crash Corosync services running in totemudp/totemudpu mode (CVSS 7.5, AV:N/PR:N). EPSS data not provided; no public exploit identified at time of analysis. Impacts high-availability cluster deployments where Corosync provides quorum and messaging services.
Technical ContextAI
Corosync is a cluster communication engine used in high-availability Linux environments to provide group messaging, quorum, and membership services. This vulnerability (CWE-190: Integer Overflow or Wraparound) affects the join message sanity validation logic when Corosync operates in totemudp or totemudpu transport modes-UDP-based communication protocols for cluster membership. An integer overflow in message parsing allows malformed UDP packets to bypass validation checks, triggering memory corruption or logic errors that crash the daemon. Affected products include Red Hat Enterprise Linux (RHEL) 7, 8, 9, and 10, plus Red Hat OpenShift Container Platform 4, all of which bundle Corosync for HA cluster services (per CPE strings cpe:2.3:a:red_hat:red_hat_enterprise_linux_*). The vulnerability requires Corosync to be configured with UDP transports; deployments using other transport modes (e.g., knet) are not affected.
RemediationAI
Patch availability per vendor advisory not independently confirmed from available data; consult Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-35092 and track Red Hat Bugzilla entries 2453169 and 2453814 for patch release announcements. As interim mitigation, organizations can switch Corosync transport from totemudp/totemudpu to knet mode if supported by their RHEL version and cluster configuration, which eliminates exposure to this UDP-based vulnerability. Network-level controls such as restricting UDP access to Corosync ports (default 5405) to trusted cluster nodes via firewall rules or VLANs reduce attack surface. Monitor cluster stability and review Corosync logs for unexpected crashes or malformed message warnings. Apply vendor-released patches immediately upon availability to affected RHEL 7, 8, 9, 10, and OpenShift 4 deployments.
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| SUSE Linux Enterprise High Availability Extension 15 SP7 | Fixed |
| SUSE Linux Enterprise High Availability Extension 16.1 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Fixed |
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise High Availability Extension 12 SP5 | Fixed |
| SUSE Linux Enterprise High Availability Extension 15 SP4 | Fixed |
| SUSE Linux Enterprise High Availability Extension 15 SP5 | Fixed |
| SUSE Linux Enterprise Server 12 SP5 | Fixed |
| SUSE Linux Enterprise Server 12 SP5-LTSS | Fixed |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | Fixed |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | Fixed |
| SUSE Linux Enterprise Desktop 12 SP3 | Fixed |
| SUSE Linux Enterprise Desktop 12 SP4 | Fixed |
| SUSE Linux Enterprise High Availability Extension 12 SP3 | Fixed |
| SUSE Linux Enterprise High Availability Extension 12 SP4 | Fixed |
| SUSE Linux Enterprise High Availability Extension 15 SP3 | Fixed |
| SUSE Linux Enterprise High Availability Extension 15 SP6 | Fixed |
| SUSE Linux Enterprise Server 12 SP3 | Fixed |
| SUSE Linux Enterprise Server 12 SP4 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP3 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP4 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | Fixed |
| openSUSE Leap 15.3 | Fixed |
| openSUSE Leap 15.4 | Fixed |
| openSUSE Leap 15.5 | Fixed |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-17881
GHSA-g4g9-h6f9-v5x2