CVE-2026-28633 in Android
Summary
by MITRE • 09/08/2026
In initForUserNoTracing of VoiceInteractionManagerService.java, there is a possible persistent denial of service due to resource exhaustion. This could lead to local denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified in the Android framework component VoiceInteractionManagerService involves a critical flaw within the initForUserNoTracing method, specifically related to improper resource management during user initialization sequences. This defect allows an attacker to trigger a persistent denial of service condition through systematic resource exhaustion. The core technical issue stems from the failure to properly limit or release system resources such as memory allocations, file descriptors, or thread contexts when handling voice interaction requests for specific users. Because this method is invoked early in the user lifecycle and potentially during background processes that do not require active foreground activity, it presents a low-barrier attack vector where an application can repeatedly invoke initialization routines without adequate cleanup mechanisms being enforced by the framework layer.
From a technical perspective, this flaw aligns with CWE-400, which describes uncontrolled resource consumption leading to denial of service conditions. The vulnerability is particularly severe because it does not require elevated privileges or complex exploitation chains. An attacker can leverage standard application permissions that are commonly granted to voice interaction services or related system components to trigger the flawed code path repeatedly. Each invocation consumes a portion of limited system resources, and due to the lack of proper deallocation or throttling mechanisms within initForUserNoTracing, these resources accumulate until the system reaches its capacity limits. This results in the degradation of service availability for all users on the device, as critical voice interaction functionalities become unresponsive or cause broader system instability.
The operational impact of this vulnerability is significant due to its potential for persistent disruption without user interaction. Since exploitation does not require physical access or explicit user consent such as clicking a malicious link or approving a permission prompt, automated background processes can exploit the flaw silently. This characteristic places the vulnerability within the ATT&CK framework under techniques related to resource hijacking and denial of service via local application execution. The persistence aspect is critical because once resources are exhausted, they may not be automatically reclaimed until a system reboot occurs, effectively rendering voice interaction features unusable for an extended period. This can disrupt accessibility services that rely heavily on voice input, impacting users who depend on these tools for device navigation and control.
Mitigation strategies must focus on enforcing strict resource limits within the VoiceInteractionManagerService initialization logic. Developers should implement robust exception handling to ensure that any allocated resources are released even if an error occurs during user setup. Additionally, introducing rate limiting or quota management for voice interaction requests can prevent a single entity from monopolizing system resources. Patching this issue requires updating the Android framework to include proper cleanup routines in initForUserNoTracing and validating input parameters before resource allocation. System administrators should also monitor for unusual spikes in memory usage associated with voice services as an indicator of potential exploitation attempts, although the primary defense remains applying vendor-provided security patches that address these internal framework flaws.