CVE-2026-76042 Overview
CVE-2026-76042 is a use of uninitialized resource vulnerability [CWE-908] in the GPU component of Google Chrome prior to version 151.0.7922.169. A remote attacker who already compromised the renderer process could read memory outside the sandbox by serving a crafted HTML page. Chromium classifies the security severity as High, though the CVSS base score is 3.1 due to the prerequisite of a compromised renderer and required user interaction.
The flaw affects the GPU process, which handles graphics operations outside the renderer sandbox. Successful exploitation leaks memory contents but does not directly grant code execution or integrity impact.
Critical Impact
Attackers chaining this bug with a renderer compromise can bypass the Chrome sandbox boundary to read GPU-process memory, exposing sensitive data from other browser contexts.
Affected Products
- Google Chrome desktop versions prior to 151.0.7922.169
- Chromium-based browsers incorporating the vulnerable GPU code path
- Downstream distributions embedding the affected Chromium build
Discovery Timeline
- 2026-08-18 - CVE-2026-76042 published to NVD
- 2026-08-19 - Last updated in NVD database
Technical Details for CVE-2026-76042
Vulnerability Analysis
The vulnerability resides in Chrome's GPU process, which runs in a separate sandboxed process handling accelerated graphics operations. Chrome allocates a resource in the GPU process without fully initializing its backing memory. When the renderer subsequently reads this resource, the response includes residual bytes from previously freed allocations.
Because the GPU process handles data from multiple origins and browser components, leaked memory may contain sensitive material such as texture data, canvas contents, or fragments of prior GPU allocations. The bug is exploitable only after an attacker has already compromised the renderer process through a separate vulnerability. This constraint reduces standalone severity but makes the flaw valuable as part of an exploit chain aimed at breaking out of the renderer sandbox.
Root Cause
The root cause is failure to zero-initialize or explicitly populate a GPU resource before it is made readable to the renderer. The affected code path allocates memory and returns it to callers without guaranteeing initialization, matching the pattern described by CWE-908: Use of Uninitialized Resource.
Attack Vector
Exploitation requires a two-stage attack. First, the attacker compromises the renderer process using a separate vulnerability, typically by luring the victim to a malicious HTML page. Second, the compromised renderer requests the uninitialized GPU resource and reads back memory that should remain isolated from the renderer. The disclosed bytes can be exfiltrated to an attacker-controlled server for offline analysis.
The vulnerability is described in prose only; no verified proof-of-concept code is publicly available. Refer to the Chromium Issue Tracker Entry and the Google Chrome Update Announcement for vendor-provided technical context.
Detection Methods for CVE-2026-76042
Indicators of Compromise
- Chrome installations running versions earlier than 151.0.7922.169 on managed endpoints
- GPU process crashes or anomalous restarts correlated with visits to untrusted sites
- Outbound connections from browser processes to unknown domains immediately following graphics-intensive page loads
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag hosts below 151.0.7922.169
- Correlate browser process telemetry with network beaconing to catch post-exploitation exfiltration attempts
- Monitor for renderer process anomalies that could indicate a prior compromise enabling this sandbox read
Monitoring Recommendations
- Ingest endpoint browser telemetry into a centralized analytics platform and alert on unpatched Chrome versions
- Track GPU process crash frequency as a potential signal of exploitation attempts against graphics code paths
- Review web proxy logs for unusual traffic patterns from browser processes to newly registered or low-reputation domains
How to Mitigate CVE-2026-76042
Immediate Actions Required
- Update Google Chrome to version 151.0.7922.169 or later on all managed endpoints
- Force-restart Chrome after the update to ensure the patched binary is loaded across all processes
- Apply corresponding updates to Chromium-based browsers such as Microsoft Edge, Brave, and Opera as vendors release them
Patch Information
Google addressed the vulnerability in the Stable channel release documented in the Google Chrome Update Announcement. Administrators should deploy Chrome 151.0.7922.169 or later through enterprise update mechanisms and validate rollout using version inventory reports.
Workarounds
- Disable GPU acceleration via the --disable-gpu command-line flag or enterprise policy where operational impact is acceptable
- Restrict browsing to trusted sites through enterprise URL allowlists until patching completes
- Enforce Chrome auto-update policies through Group Policy or MDM to reduce time-to-patch on future releases
# Configuration example: enforce minimum Chrome version via Group Policy registry key (Windows)
reg add "HKLM\Software\Policies\Google\Chrome" /v TargetVersionPrefix /t REG_SZ /d "151.0.7922.169" /f
reg add "HKLM\Software\Policies\Google\Chrome" /v UpdateDefault /t REG_DWORD /d 1 /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
