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medium advisory

Red Hat Enterprise Linux (pacemaker) Vulnerability Enables Denial of Service

A vulnerability in Red Hat Enterprise Linux (pacemaker) allows a remote, unauthenticated attacker to perform a Denial of Service attack, potentially disrupting the availability of affected systems.

A critical vulnerability, identified as WID-SEC-2026-2345, exists within Red Hat Enterprise Linux, specifically affecting the pacemaker component. This flaw permits a remote, unauthenticated attacker to conduct a Denial of Service (DoS) attack. Published by CERT-Bund on July 15, 2026, this vulnerability could lead to the complete disruption of services and applications running on vulnerable systems. The unauthenticated and remote nature of the exploit makes it a high-risk concern, as it allows attackers to impact system availability without prior access or credentials. Organizations leveraging Red Hat Enterprise Linux with the pacemaker component are advised to address this vulnerability promptly to prevent severe operational downtime.

Impact

Successful exploitation of this vulnerability would lead to a Denial of Service for Red Hat Enterprise Linux systems utilizing the pacemaker component. This means that essential services and applications hosted on these systems would become inaccessible, resulting in operational disruptions, potential data loss for ongoing processes, and significant financial repercussions for organizations dependent on these systems. Given the unauthenticated and remote attack vector, a wide array of Red Hat deployments are susceptible if left unpatched, allowing attackers to cause widespread unavailability.

Recommendation

  • Apply all available security updates for Red Hat Enterprise Linux, especially those pertaining to the pacemaker component, as soon as possible to mitigate WID-SEC-2026-2345.
  • Monitor system logs, specifically for the Red Hat Enterprise Linux operating system, for any unusual activity or service disruptions that might indicate attempted or successful exploitation of this vulnerability.