CVE-2026-102315 in Chrome
Summary
by MITRE • 09/29/2026
Uninitialized resource in Media in Google Chrome on on Windows prior to 154.0.8037.92 allowed a remote attacker who had compromised the renderer process 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 described involves an uninitialized resource state within the media handling subsystem of Google Chrome on Windows, specifically affecting versions prior to 154.0.8037.92. This flaw represents a critical failure in memory management and initialization protocols during the processing of multimedia content. When the browser encounters specific media-related operations triggered by a crafted HTML page, it fails to properly initialize certain internal data structures or pointers before they are accessed. In software engineering terms, this is a classic instance where variables or resources are used without being assigned an initial value, leading to undefined behavior that can be exploited for malicious purposes. The severity of this issue is classified as high by the Chromium security team due to its potential to bypass critical isolation mechanisms inherent in modern web browsers.
The operational impact of this vulnerability centers on the ability of a remote attacker to read memory outside the browser's sandbox environment. Modern browsers like Chrome employ a multi-process architecture where renderer processes are heavily restricted and isolated from sensitive system resources through sandboxes. This design ensures that even if an attacker successfully exploits a vulnerability within a web page, they cannot easily access the user's file system, other tabs, or host operating system details. However, by leveraging this uninitialized resource flaw in the media component, an attacker who has already compromised the renderer process can execute code that reads arbitrary memory locations beyond the sandbox boundaries. This effectively breaks the isolation model, allowing for potential information disclosure of sensitive data stored in adjacent memory spaces, such as credentials, session tokens, or other private user information held by the browser.
From a technical classification perspective, this vulnerability aligns with CWE-457, which defines the use of an uninitialized variable. This category encompasses situations where software uses a variable that has not been properly initialized, leading to unpredictable behavior and potential security breaches. Furthermore, in the context of the MITRE ATT&CK framework, this exploit technique relates to techniques involving memory corruption or unauthorized access to protected resources. Specifically, it facilitates lateral movement within the browser's process space and can serve as a stepping stone for further exploitation if combined with other vulnerabilities that allow code execution outside the sandbox. The attack vector is remote via a crafted HTML page, meaning no user interaction beyond visiting a malicious site is required, which significantly increases the risk profile of this vulnerability.
Mitigation strategies primarily involve updating to the patched version of Google Chrome, specifically version 154.0.8037.92 or later, where these initialization checks have been corrected. For organizations unable to patch immediately, deploying browser hardening policies can help mitigate risks by restricting access to certain media features or disabling JavaScript execution on untrusted sites through group policy settings. Additionally, ensuring that endpoint detection and response systems are configured to monitor for unusual memory access patterns in renderer processes can provide an additional layer of defense against exploitation attempts. Regular security audits focusing on resource initialization practices within multimedia processing libraries are also recommended to prevent similar flaws from being introduced in future updates.