CVE-2026-106370 in Chrome
Summary
by MITRE • 10/07/2026
Uninitialized resource in GPU in Google Chrome on on Android prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to read memory outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an uninitialized resource issue within the GPU subsystem of Google Chrome on Android, specifically in versions prior to 155.0.8059.39, represents a significant breach in memory safety protocols that can be leveraged for arbitrary code execution or sensitive data exfiltration. This flaw stems from improper initialization of resources allocated by the graphics processing unit interface, which fails to zero out or validate memory buffers before they are accessed or rendered. In modern browser architectures like Chromium, security is heavily reliant on process isolation and sandboxing mechanisms designed to contain potential exploits within a restricted environment. However, when an uninitialized resource is introduced into this pipeline, it creates a pathway for information leakage that bypasses these critical defensive layers.
From a technical perspective, the core of this vulnerability lies in how memory buffers are handled during GPU-accelerated operations. When a renderer process requests graphical resources, such as textures or framebuffers, the system allocates physical memory pages. If these allocations are not properly initialized with null values or if their state is not correctly tracked before being mapped into user-space accessible regions, residual data from previous processes or kernel structures may remain in those memory locations. An attacker who has already achieved code execution within a compromised renderer process can exploit this lack of initialization to read contents from adjacent memory spaces that should be inaccessible due to sandbox restrictions. This effectively allows the malicious script to peek outside its designated security boundary, accessing sensitive information such as cookies, session tokens, or credentials stored in other tabs or processes.
The operational impact of this vulnerability is severe because it undermines the fundamental trust model of web browsers. By allowing a remote attacker to read memory outside the sandbox via a crafted HTML page, the flaw enables potential data theft and further privilege escalation attacks. Although the Chromium security severity is rated as Medium, indicating that exploitation requires specific conditions such as renderer compromise, this condition is increasingly common due to the prevalence of drive-by download sites and malicious advertisements. Once an attacker can read arbitrary memory, they can gather enough context about the browser's internal state to craft more sophisticated exploits targeting other components or to exfiltrate user data directly. This capability transforms a contained rendering error into a full-scale security breach with tangible consequences for user privacy and system integrity.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) category CWE-457, which describes the use of an uninitialized variable, and CWE-120, involving buffer overflows without proper bounds checking in certain contexts where memory layout is manipulated. Furthermore, from a tactical standpoint within the MITRE ATT&CK framework for enterprise security, this exploit technique corresponds to Tactic TA0006 (Credential Access) under Technique T1539 (Steal Web Session Cookie), as well as potentially T1074 (Data Staged) if the exfiltrated data is used for further staging. The attack vector falls under Initial Access or Execution depending on how the renderer was compromised, but the lateral movement aspect of escaping the sandbox places it firmly in the context of privilege escalation and defense evasion strategies employed by advanced persistent threats.
Mitigation for this vulnerability primarily involves updating Google Chrome to version 155.0.8059.39 or later on Android devices, as these updates include patches that ensure proper initialization of GPU resources before they are exposed to the renderer process. Security administrators should enforce automatic update policies to minimize the window of exposure. Additionally, users can mitigate risk by disabling JavaScript in untrusted sites or using browser extensions that restrict access to certain APIs if available. From a development standpoint, enforcing strict memory management practices and utilizing static analysis tools during the Chromium build process can help detect similar uninitialized resource issues before they reach production builds. Continuous monitoring for anomalous GPU behavior and implementing sandboxing enhancements such as Site Isolation further reduce the attack surface by ensuring that even if one renderer is compromised, it cannot easily access resources belonging to other sites or system components.