Corosync: corosync: denial of service via integer overflow in join message validation
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.0%
exploitation probability
1.0%top 39% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Red Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat · Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat · Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat · Red Hat OpenShift Container Platform 4References
https://access.redhat.com/errata/RHSA-2026:13644https://access.redhat.com/errata/RHSA-2026:13657https://access.redhat.com/errata/RHSA-2026:13673https://access.redhat.com/errata/RHSA-2026:14205https://access.redhat.com/errata/RHSA-2026:14210https://access.redhat.com/errata/RHSA-2026:14211https://access.redhat.com/errata/RHSA-2026:14212https://access.redhat.com/errata/RHSA-2026:14213https://access.redhat.com/errata/RHSA-2026:14214https://access.redhat.com/errata/RHSA-2026:14215https://access.redhat.com/errata/RHSA-2026:14216https://access.redhat.com/errata/RHSA-2026:19043