CVE-2026-95359 in Chrome
Summary
by MITRE • 09/29/2026
Uninitialized resource in GPU in Google Chrome on on Android prior to 154.0.8037.57 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 • 09/29/2026
The vulnerability identified as an uninitialized resource issue within the Graphics Processing Unit subsystem of Google Chrome on Android represents a significant breach in the browser's isolation model, specifically affecting versions prior to 154.0.8037.57. This flaw resides deep within the rendering pipeline where GPU commands are processed and executed by the hardware accelerator. The core technical deficiency involves the failure to properly initialize memory buffers or state variables associated with GPU operations before they are utilized for data processing or display purposes. When a renderer process, which is typically confined within a sandboxed environment designed to limit its access to system resources, interacts with these uninitialized regions, it can inadvertently trigger undefined behavior in the graphics driver stack. This lack of initialization means that memory locations may contain stale data from previous operations or arbitrary values left over from prior allocations, creating an opportunity for information leakage if accessed incorrectly by malicious code.
From a technical perspective, this vulnerability aligns closely with CWE-457, which describes the use of uninitialized variables, and potentially CWE-120, involving buffer overflows if the uninitialized state leads to incorrect boundary calculations during GPU command execution. The attack vector is classified as remote because it requires only that an attacker can host or direct a user to a crafted HTML page containing malicious JavaScript or WebGL code. Once executed within the context of a compromised renderer process, this code exploits the gap between the software-level sandbox restrictions and the hardware-level memory access permissions granted by the GPU driver. By carefully crafting input data that triggers specific GPU shader executions or texture operations, an attacker can force the browser to read from these uninitialized memory regions. This action effectively bypasses the Chromium security model's intent to keep renderer processes isolated from sensitive host system memory, allowing the reading of arbitrary memory contents outside the sandbox boundary.
The operational impact of this vulnerability is substantial due to its potential for information disclosure and further exploitation chains. An attacker who successfully exploits this flaw can read portions of the browser process memory that should remain inaccessible, potentially exposing session cookies, authentication tokens, private keys, or other sensitive data stored in adjacent memory blocks. This capability undermines the fundamental security principle of least privilege applied to web content execution. Furthermore, such information leakage often serves as a precursor to more severe attacks, including arbitrary code execution if the leaked pointers are used to bypass additional protections like ASLR (Address Space Layout Randomization). The Chromium project has classified this issue with a medium severity rating, reflecting its potential for exploitation but also acknowledging that it requires specific conditions regarding renderer compromise and GPU state management.
Mitigation strategies primarily involve updating Google Chrome on Android to version 154.0.8037.57 or later, where the initialization routines have been corrected to ensure all GPU-related resources are properly zeroed out or validated before use. For organizations deploying managed devices, enforcing automatic browser updates is critical to closing this window of exposure. Additionally, security teams should monitor for indicators of compromise related to unusual memory access patterns in renderer processes and consider implementing strict Content Security Policy directives that restrict the execution of untrusted scripts capable of interacting with WebGL or other GPU-accelerated APIs. From a defensive architecture standpoint, ensuring that hardware-level protections such as Memory Protection Extensions are enabled on supported Android devices can provide an additional layer of defense against memory corruption vulnerabilities, although software patching remains the primary remediation path for this specific flaw.