CVE-2026-28671 in Android
Summary
by MITRE • 09/08/2026
In updateInternal of MediaProvider.java, there is a possible expose contents of files due to a race condition. This could lead to local information disclosure 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 updateInternal method within MediaProvider.java represents a critical security flaw rooted in improper synchronization mechanisms during file content handling operations. As a media provider component, this module is responsible for managing access to multimedia files stored on the device, acting as an intermediary between applications and the underlying storage system. The core technical issue lies in a race condition that occurs when multiple threads or processes attempt to read or modify the state of these files simultaneously without adequate locking mechanisms. This lack of atomicity allows an attacker to exploit timing gaps where sensitive file contents can be accessed before proper access controls are fully enforced or updated, effectively bypassing intended security boundaries.
From a technical perspective, this flaw aligns with CWE-362, which classifies concurrent execution using shared resources with insufficient synchronization as a race condition vulnerability. The specific manifestation in MediaProvider.java suggests that the method fails to properly serialize access to file descriptors or metadata updates. When an application requests media content, the provider must ensure that only authorized users can retrieve the data based on their permissions and ownership settings. However, due to the race condition, it is possible for a malicious process to interleave its read operations with legitimate system processes, capturing data fragments or full contents of files that should remain private. This exploitation does not require elevated privileges because media providers typically run with broad access rights to facilitate seamless app functionality, making them attractive targets for privilege escalation via information disclosure rather than direct code execution.
The operational impact of this vulnerability is significant local information disclosure. An attacker who can trigger the race condition through a malicious application or script can extract sensitive personal data such as photos, videos, audio recordings, and associated metadata from other applications on the device. Since user interaction is not required for exploitation, the attack vector is highly efficient and stealthy. The victim may remain unaware that their private media files have been exfiltrated during routine system operations. This type of vulnerability undermines the fundamental trust model of mobile operating systems where sandboxing relies heavily on strict enforcement of file access policies at every step of the data retrieval pipeline.
In terms of threat modeling, this scenario maps to ATT&CK technique T1005, which covers Data from Local System Retrieval. The attacker leverages local application vulnerabilities to gather intelligence without needing network connectivity or remote execution capabilities. This makes it particularly dangerous in scenarios where physical access is limited but software installation privileges exist, such as on shared devices or compromised workstations. The absence of user interaction further lowers the barrier for exploitation, allowing automated tools to probe and exploit this weakness repeatedly until successful data extraction occurs.
Mitigation strategies must focus on strengthening synchronization primitives within the MediaProvider codebase. Developers should implement robust locking mechanisms, such as read-write locks or mutexes, around critical sections that handle file access and metadata updates. Ensuring atomicity in these operations will prevent interleaving of unauthorized requests with legitimate system processes. Additionally, implementing strict validation checks before any data is returned to requesting applications can provide a secondary layer of defense. Regular code audits focusing on concurrency issues are essential to identify similar patterns elsewhere in the media framework. Security patches should prioritize fixing this race condition by enforcing exclusive access during critical file operations and validating permissions at multiple stages of the request lifecycle rather than relying solely on initial checks that may become stale due to timing delays.