CVE-2026-102307 in Chrome
Summary
by MITRE • 09/29/2026
Uninitialized resource in Dawn in Google Chrome on on Android prior to 154.0.8037.92 allowed a remote attacker to read memory outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an uninitialized resource issue within the Dawn graphics engine of Google Chrome on Android represents a significant security flaw that compromises the integrity of the browser's isolation mechanisms. This specific defect, present in versions prior to 154.0.8037.92, stems from improper initialization of memory resources allocated during the rendering process. When an attacker crafts a malicious HTML page containing specially designed web content or scripts, they can trigger this uninitialized state within the Dawn component. The core technical flaw lies in the failure to properly zero out or initialize specific data structures before they are accessed for reading operations. This oversight allows the application to read from memory locations that have not been securely prepared, leading to a classic use-after-free or information disclosure scenario where sensitive data residing in adjacent memory blocks is exposed.
The operational impact of this vulnerability is severe due to its potential to bypass Chrome's sandboxing architecture. The browser relies heavily on sandboxes to restrict the privileges of web content, ensuring that malicious scripts cannot access system-level resources or user data outside their designated boundaries. By exploiting the uninitialized resource in Dawn, a remote attacker can achieve out-of-bounds memory reads. This capability effectively breaks the isolation layer, allowing the attacker to extract arbitrary information from the browser's process space. Such an exploit could lead to the leakage of sensitive cookies, session tokens, or other confidential data stored within the browser context. Furthermore, depending on the specific memory layout and subsequent exploitation techniques, this initial read primitive might serve as a stepping stone for more complex attacks, including code execution vulnerabilities if combined with additional primitives like type confusion or heap spraying techniques.
From a classification perspective, this vulnerability aligns closely with CWE-457, which describes the use of an uninitialized variable, and CWE-125, known as out-of-bounds read. These categories highlight the fundamental programming errors that allow access to memory regions beyond intended boundaries. In terms of offensive security frameworks such as MITRE ATT&CK, this exploit falls under techniques related to Tactic TA0004 (Privilege Escalation) and specifically aligns with methods like T1078 (Valid Accounts) or more broadly the exploitation of software vulnerabilities for initial access and lateral movement within a compromised environment. The ability to read memory outside the sandbox is particularly dangerous as it undermines the foundational security model of modern web browsers, which depend on strict separation between untrusted web content and trusted browser processes.
Mitigation strategies primarily involve updating Google Chrome on Android devices to version 154.0.8037.92 or later, where this initialization flaw has been corrected by developers ensuring that all resources are properly initialized before use. For organizations managing fleets of mobile devices, enforcing automatic updates through Mobile Device Management (MDM) solutions is critical to ensure timely patching. Additionally, users should exercise caution when visiting untrusted websites and consider enabling enhanced security features such as Safe Browsing or sandboxed browsing modes where available. Security teams should also monitor for indicators of compromise that might suggest exploitation attempts, although the complexity of exploiting uninitialized memory issues often limits widespread automated attacks unless combined with other vulnerabilities in a chain. Regular vulnerability assessments and keeping all software components up to date remain the most effective defenses against such high-severity browser-based exploits.