CVE-2026-58224

A flaw was found in Samba's CTDB, the clustered database service used by Samba. Insufficient integrity validation of received CTDB protocol packets allows malformed packets containing invalid field lengths, improperly terminated strings, or inconsistent packet sizes to be processed without adequate bounds checking. A remote attacker with access to the CTDB private network may trigger a denial of service through process crashes or excessive memory consumption and, in limited cases, disclose adjacent memory contents.

CTDB is an optional clustering component of Samba used strictly for multi-node active/active file sharing and is not installed, configured, or running by default on standard Red Hat Enterprise Linux (RHEL) deployments.

Red Hat historically supported CTDB in RHEL High Availability and Resilient Storage configurations (including RHEL 6 and RHEL 7) and officially deprecated standalone CTDB usage as of RHEL 8.4 in favor of Pacemaker-managed cluster deployments.

Network Architecture Mitigations: For legacy or historical environments actively utilizing CTDB via supported RHEL High Availability or Resilient Storage cluster configurations, Red Hat’s official Support Policies for RHEL High Availability Clusters explicitly mandate that CTDB private interconnect traffic must run on a dedicated, isolated private network segment segregated from client networks. Because the CTDB protocol is unauthenticated by design, untrusted client traffic cannot reach the daemon in any supported architecture.

https://access.redhat.com/articles/3278591

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/8.4_release_notes/deprecated_functionality#BZ-1916296

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.