CVE-2026-20755 in LLM Scaler software
Summary
by MITRE • 08/12/2026
Protection mechanism failure for some LLM Scaler software within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with a privileged user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires passive user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical protection mechanism failure within LLM Scaler software operating in Ring 3 user applications that enables unauthorized privilege escalation. The flaw exists in the software's privilege management system where unprivileged processes can potentially exploit weaknesses in the access control mechanisms to elevate their privileges to those of privileged users. This type of vulnerability aligns with CWE-276, which specifically addresses improper privilege management and inadequate access control implementations. The attack vector requires local access and leverages a combination of low complexity attack methods that can be executed by adversaries who already possess user-level credentials. The security implications are severe as the vulnerability affects all three fundamental security properties defined in the CIA triad.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass comprehensive system compromise across confidentiality, integrity, and availability domains. Attackers with unprivileged access can potentially gain full system control through this mechanism, leading to complete system compromise where no protection remains for confidentiality, integrity, or availability. The requirement for passive user interaction suggests that the attack may be initiated through seemingly legitimate user activities or application interactions, making detection more challenging. This vulnerability directly maps to ATT&CK technique T1068, which covers local privilege escalation through various mechanisms including improper access control and privilege management failures.
The technical implementation flaw likely stems from inadequate validation of privilege levels within the LLM Scaler software's user application environment. The software may not properly enforce the security boundaries that separate user mode operations from privileged system operations, allowing malicious code execution to bypass normal privilege checking mechanisms. This type of vulnerability often occurs when developers assume that all user-space components will respect privilege boundaries or when access control lists are improperly implemented. The low complexity requirement indicates that the attack methods do not require specialized knowledge or sophisticated tools, making it particularly dangerous as it can be exploited by adversaries with minimal technical expertise.
Mitigation strategies should focus on implementing robust privilege separation mechanisms and strengthening access control enforcement within user applications. Organizations should deploy comprehensive monitoring solutions to detect unauthorized privilege escalation attempts and implement least privilege principles where possible. The vulnerability highlights the importance of proper security testing including privilege escalation scenarios during development phases, as well as regular security assessments of all Ring 3 components that may interact with privileged system functions. Additionally, implementing runtime protection mechanisms such as exploit prevention systems and application control measures can help prevent exploitation of this vulnerability by blocking unauthorized privilege elevation attempts.