CVE-2025-8292: Google Chrome Use After Free Vulnerability

CVE-2025-8292 Overview

CVE-2025-8292 is a use-after-free vulnerability in the Media Stream component of Google Chrome. The flaw affects Chrome versions prior to 138.0.7204.183 across Windows, macOS, and Linux. A remote attacker can exploit heap corruption by serving a crafted HTML page to a target user. Successful exploitation can lead to arbitrary code execution within the renderer process. Google classifies the Chromium security severity as High, and the issue is tracked under [CWE-416].

Critical Impact
A remote attacker can trigger heap corruption in the Chrome renderer through a crafted web page, enabling potential code execution after minimal user interaction.

Affected Products

Google Chrome prior to 138.0.7204.183
Chrome installations on Microsoft Windows, Apple macOS, and Linux
Chromium-based browsers incorporating the affected Media Stream code

Discovery Timeline

2025-07-30 - CVE-2025-8292 published to NVD
2025-08-01 - Last updated in NVD database

Technical Details for CVE-2025-8292

Vulnerability Analysis

The vulnerability resides in Chrome's Media Stream implementation, which handles real-time audio and video capture through the WebRTC getUserMedia and related browser APIs. A use-after-free condition occurs when the browser continues to reference a heap object after it has been freed. An attacker who controls the timing of object lifetime can place attacker-controlled data into the reclaimed memory region. Subsequent dereferences of the dangling pointer then operate on attacker-influenced memory, producing heap corruption.

Because the Media Stream component runs inside the renderer process, exploitation typically yields code execution within the renderer sandbox. Chained with a separate sandbox escape, this primitive can lead to full compromise of the user account on the host system.

Root Cause

The root cause is improper lifetime management of Media Stream objects, classified as [CWE-416] Use After Free. The component releases a heap-allocated object while another code path retains and later dereferences a pointer to it. JavaScript executing on a malicious page can drive the Media Stream APIs into the unsafe state and reclaim the freed allocation with controlled data.

Attack Vector

Exploitation is remote and requires user interaction limited to visiting an attacker-controlled or compromised web page. No authentication is required. The attacker delivers JavaScript and HTML that manipulates Media Stream objects to trigger the dangling pointer, then sprays the heap to gain control of the freed slot. The vulnerability mechanism is documented in the Chromium Issue Tracker Entry and the Google Chrome Update Announcement.

Detection Methods for CVE-2025-8292

Indicators of Compromise

Chrome renderer process crashes with heap corruption signatures, such as SIGSEGV in media-related modules or Windows Watson reports referencing content.dll media stream symbols.
Outbound connections from chrome.exe to recently registered domains immediately following user navigation to an unfamiliar page.
Unexpected child processes spawned by Chrome renderer processes, indicating possible post-exploitation activity.

Detection Strategies

Inventory Chrome installations across the fleet and flag any version below 138.0.7204.183 as vulnerable.
Hunt for Chrome crash telemetry correlated with WebRTC or getUserMedia API usage on untrusted domains.
Monitor process lineage to detect renderer processes launching shells, scripting interpreters, or LOLBins.

Monitoring Recommendations

Forward browser crash dumps and Chrome --enable-logging output to a centralized log platform for triage.
Alert on Chrome renderer processes performing unexpected file writes outside the user profile directory.
Track DNS and web proxy logs for navigations preceding renderer crashes to identify potential exploit delivery infrastructure.

How to Mitigate CVE-2025-8292

Immediate Actions Required

Update Google Chrome to version 138.0.7204.183 or later on Windows, macOS, and Linux endpoints.
Restart all Chrome instances after the update so the patched binaries take effect.
Audit Chromium-based browsers, such as Edge, Brave, Opera, and Vivaldi, and apply vendor updates that incorporate the upstream fix.

Patch Information

Google released the fix in the Stable channel update announced on July 29, 2025. The patched build is Chrome 138.0.7204.183 for Windows, macOS, and Linux. Refer to the Google Chrome Update Announcement for release notes and the Chromium Issue Tracker Entry for the underlying bug record.

Workarounds

Enforce automatic Chrome updates through enterprise policy so endpoints receive the patched build without user action.
Restrict Media Stream permissions through the VideoCaptureAllowed and AudioCaptureAllowed enterprise policies for users who do not require WebRTC.
Use web filtering to block access to untrusted sites until all endpoints are confirmed patched.

bash

# Configuration example: verify Chrome version on Linux endpoints
google-chrome --version

# Windows enterprise policy snippet to enforce updates
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f