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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade corosyncUpgrade corosync-vqsimUpgrade corosynclibUpgrade corosynclib-develUpgrade spausedd | May 6, 2026 | May 5, 2026 |
| Amazon_linux_2023 | — | Upgrade corosync-vqsimUpgrade corosyncUpgrade corosync-vqsim-debuginfoUpgrade corosync-debugsourceUpgrade corosynclib-develUpgrade corosynclib-debuginfoUpgrade corosync-debuginfoUpgrade corosynclib | Apr 14, 2026 | Apr 1, 2026 |
| Debian | — | Upgrade corosync | May 12, 2026 | May 12, 2026 |
| Oracle_linux | — | Upgrade corosync-vqsimUpgrade corosyncUpgrade corosynclib | May 8, 2026 | Apr 1, 2026 |
| Redhat_linux | — | Upgrade corosync-qdeviceUpgrade corosynclib-debuginfoUpgrade corosync-qnetdUpgrade corosync-debugsourceUpgrade corosync-vqsim-debuginfoUpgrade corosync-vqsimUpgrade spauseddUpgrade spausedd-debuginfoUpgrade corosynclibUpgrade corosynclib-develUpgrade corosync-debuginfoUpgrade corosync | May 7, 2026 | Apr 1, 2026 |
| Rocky_linux | — | Upgrade corosync-debugsourceUpgrade corosync-vqsimUpgrade corosynclib-debuginfoUpgrade corosynclib-develUpgrade corosynclibUpgrade corosync-vqsim-debuginfoUpgrade corosyncUpgrade corosync-debuginfoUpgrade spauseddUpgrade spausedd-debuginfo | May 11, 2026 | May 6, 2026 |
| Ubuntu | — | Upgrade corosync | Apr 14, 2026 | Apr 1, 2026 |
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