CVE-2026-58224
Description
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.
Statement
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Adjacent Network | N/A | Adjacent Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Other
Data that is parsed and used may be corrupted.
Non-Repudiation,Other
Technical Impact: Hide Activities; Other
Without a checksum it is impossible to determine if any changes have been made to the data after it was sent.
Acknowledgements
Red Hat would like to thank Andrew Tridgell, Martin Schwenke (Samba Team), and Tristan Madani (Talence Security) for reporting this issue.
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