Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Event Logging Service allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.0",
  "pubDate": "2026-08-11T17:18:06.583Z",
  "pubdate": "2026-08-11T17:18:06.583Z",
  "executiveSummary": "A privilege escalation vulnerability exists within the Windows Event Logging Service, stemming from concurrent execution utilizing a shared resource with improper synchronization, commonly categorized as a race condition.\nSuccessful exploitation of this flaw allows a locally authenticated attacker to elevate their privileges on the target system.\nThe affected product is the Windows Event Logging Service, which is a core component of the Microsoft Windows operating system.\nThe risk implications are significant, as a low-privileged local user can leverage this vulnerability to gain higher-level privileges, potentially compromising the confidentiality, integrity, and availability of the entire operating system.\nAttacker capabilities are constrained by the requirement of local access to the target machine; however, the attacker must already possess authorization to interact locally with the system.\nThe primary exploitation requirement is the ability to execute code locally and race the improper synchronization mechanism within the shared resource utilized by the logging service.",
  "technicalDetails": "The root cause of the vulnerability resides in the Windows Event Logging Service's handling of concurrent execution involving a shared resource.\nDue to improper synchronization, a window of vulnerability opens during resource access operations.\nThe vulnerable component is the internal mechanism responsible for managing shared resources and synchronization within the Windows Event Logging Service.\nExploitation requires local authentication and specific privilege requirements that allow the attacker to execute processes capable of interacting with the logging service.\nNetwork exposure is not required, as the attack vector is strictly local.\nThe exploitation method relies on a race condition attack vector.\nAn attacker initiates concurrent operations designed to target the unsynchronized shared resource managed by the Windows Event Logging Service.\nBy precisely timing these operations, the attacker intercepts or manipulates the state of the shared resource during the synchronization gap.\nThis race condition manipulation subverts the intended security boundaries of the logging service.\nConsequently, the attacker achieves local privilege escalation, transitioning from a low-privileged execution context to an elevated privilege level.\nPost-exploitation impact includes the execution of arbitrary code with the elevated privileges acquired through the race condition, enabling further system compromise."
}