CVE-2026-14514 Overview
CVE-2026-14514 is a denial-of-service vulnerability in IBM Reliable Scalable Cluster Technology (RSCT) 3.0. The flaw stems from improper input validation in the request handling logic. A remote attacker on an adjacent network can send a specially crafted request to trigger the condition. Successful exploitation exhausts resources and disrupts availability of RSCT services. The vulnerability is classified under [CWE-770] (Allocation of Resources Without Limits or Throttling). No public exploit code or in-the-wild exploitation has been reported at the time of publication. Administrators managing IBM clustered environments running RSCT 3.0 should evaluate exposure and apply the IBM-supplied fix.
Critical Impact
A remote attacker with adjacent network access can trigger a denial-of-service condition against RSCT 3.0 without authentication or user interaction.
Affected Products
- IBM Reliable Scalable Cluster Technology (RSCT) 3.0
Discovery Timeline
- 2026-08-19 - CVE-2026-14514 published to NVD
- 2026-08-20 - Last updated in NVD database
Technical Details for CVE-2026-14514
Vulnerability Analysis
RSCT is IBM's foundation software for clustered systems, providing infrastructure services used by products such as PowerHA SystemMirror and AIX cluster tooling. CVE-2026-14514 exists in the request-processing path of RSCT 3.0. The service fails to validate inputs before allocating or consuming resources. An attacker sends a malformed request from an adjacent network position, causing the RSCT process to consume resources without appropriate limits.
The attack does not require authentication or user interaction. Confidentiality and integrity are not affected, but availability of the RSCT service is impacted. Because RSCT underpins cluster management, a denial-of-service condition can cascade into monitoring gaps, failover disruption, and management-plane outages in dependent cluster software.
Root Cause
The underlying weakness is [CWE-770], allocation of resources without limits or throttling combined with improper input validation. RSCT accepts crafted request payloads without enforcing bounds on the resulting resource consumption. This allows a single malformed message to drive the service toward exhaustion.
Attack Vector
The attack vector is adjacent network, meaning the attacker must be on the same broadcast domain, VLAN, or logically adjacent network segment as the target. Attack complexity is low and no privileges are required. The attacker delivers a crafted request to the RSCT listener and observes service degradation or unavailability. See the IBM Support advisory for node 7283963 for vendor-supplied technical details.
Detection Methods for CVE-2026-14514
Indicators of Compromise
- Unexpected termination, restart, or hang of RSCT daemons such as ctrmc, IBM.ConfigRMd, or IBM.HostRMd on cluster nodes.
- Anomalous inbound traffic to RSCT service ports originating from adjacent network hosts.
- Cluster management operations failing or timing out without corresponding hardware or OS faults.
Detection Strategies
- Monitor RSCT process health and memory or CPU consumption for sudden spikes correlated with inbound traffic.
- Inspect network flow records for malformed or oversized requests directed at RSCT listener ports on cluster subnets.
- Correlate cluster manager error logs with network telemetry to identify request patterns preceding service degradation.
Monitoring Recommendations
- Enable verbose logging on RSCT subsystems and forward logs to a centralized SIEM for retention and correlation.
- Baseline normal RSCT traffic volumes between cluster nodes and alert on deviations from that baseline.
- Track cluster resource manager restarts and generate alerts when restart frequency exceeds operational norms.
How to Mitigate CVE-2026-14514
Immediate Actions Required
- Review the IBM Support advisory for node 7283963 and apply the vendor-provided fix for RSCT 3.0.
- Inventory all cluster nodes running RSCT 3.0 and prioritize patching for internet-adjacent or shared-network deployments.
- Restrict access to RSCT service ports to trusted cluster interconnect subnets only.
Patch Information
IBM has published remediation guidance on the IBM Support page for node 7283963. Administrators should follow the vendor instructions to update RSCT 3.0 to the fixed level.
Workarounds
- Segment cluster interconnect networks and enforce network access control lists that block RSCT traffic from non-cluster hosts.
- Place cluster nodes on dedicated VLANs with no adjacency to user or untrusted networks until patches are applied.
- Rate-limit or filter malformed traffic to RSCT ports using host-based firewalls where feasible.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
