CVE-2025-48630: Google Android Privilege Escalation Flaw

CVE-2025-48630 Overview

CVE-2025-48630 is a side channel information disclosure vulnerability in the drawLayersInternal function of SkiaRenderEngine.cpp within Google Android. The flaw allows attackers to access GPU cache data through timing-based side channel attacks, which can lead to local escalation of privilege without requiring additional execution privileges or user interaction.

Critical Impact

Attackers can exploit GPU cache side channel leakage to escalate privileges locally on affected Android devices without any user interaction required.

Affected Products

• Google Android 14.0
• Google Android 15.0
• Google Android 16.0 (including QPR2 Beta 1, Beta 2, and Beta 3)

Discovery Timeline

• 2026-03-02 - CVE-2025-48630 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2025-48630

Vulnerability Analysis

This vulnerability exists within the Skia rendering engine, specifically in the drawLayersInternal function of SkiaRenderEngine.cpp. The flaw is classified under CWE-208 (Observable Timing Discrepancy), indicating that the vulnerability stems from observable differences in processing time that can be exploited to infer sensitive information about GPU cache contents.

The rendering engine fails to adequately protect against timing-based side channel attacks when processing graphics layers. By carefully measuring the time taken to execute certain rendering operations, an attacker can deduce information about cached data, effectively bypassing intended memory isolation boundaries. This information leakage can then be leveraged to achieve privilege escalation on the local device.

The attack requires local access but does not require any special execution privileges. Once an attacker can run code on the device (such as through a malicious application), they can exploit this vulnerability without any user interaction.

Root Cause

The root cause of CVE-2025-48630 lies in the lack of constant-time operations when accessing GPU cache within the drawLayersInternal function. The SkiaRenderEngine does not implement adequate mitigations against timing side channel attacks, allowing observable timing differences that correlate with cached data states. This represents a classic side channel vulnerability where the execution timing of graphics operations inadvertently reveals sensitive information about the underlying system state.

Attack Vector

The attack is performed locally on the affected Android device. An attacker would need to deploy malicious code (such as through a rogue application) that performs carefully timed rendering operations and measures the response times. By analyzing these timing measurements, the attacker can infer information about GPU cache contents. This information can then be used to escalate privileges on the system without requiring any elevated permissions to initiate the attack.

The vulnerability mechanism involves measuring timing variations in graphics rendering operations to infer GPU cache state information. The drawLayersInternal function processes layer data through the Skia rendering pipeline, and timing discrepancies in this process can reveal cached data patterns. See the Android Security Bulletin March 2026 for additional technical details.

Detection Methods for CVE-2025-48630

Indicators of Compromise

• Unusual timing measurement patterns from applications accessing graphics subsystems
• Applications performing repetitive rendering operations with precise timing measurements
• Suspicious process behavior correlating rendering API calls with memory or privilege access attempts

Detection Strategies

• Monitor for applications making excessive calls to graphics rendering APIs with abnormal timing patterns
• Implement behavioral analysis to detect applications attempting to measure rendering operation latencies
• Deploy application sandboxing solutions that can detect side channel attack patterns

Monitoring Recommendations

• Enable detailed logging for graphics subsystem operations on sensitive devices
• Monitor device security logs for signs of privilege escalation attempts following graphics API activity
• Consider deploying mobile threat defense solutions capable of detecting timing-based attack behaviors

How to Mitigate CVE-2025-48630

Immediate Actions Required

• Apply the latest Android security patches as described in the Android Security Bulletin March 2026
• Review installed applications and remove any suspicious or untrusted software
• Ensure all devices are running supported Android versions that receive security updates
• Consider deploying mobile device management (MDM) solutions to enforce security patch compliance

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin March 2026. Organizations and users should apply the March 2026 security patch level or later to remediate this vulnerability. The patch implements mitigations within the SkiaRenderEngine to prevent timing-based side channel attacks against GPU cache data.

Workarounds

• Restrict installation of applications to trusted sources only (Google Play Store with Play Protect enabled)
• Implement application vetting processes before deployment on enterprise devices
• Use mobile threat defense solutions to detect and block potentially malicious applications
• Consider network-level controls to monitor for data exfiltration attempts following exploitation

# Verify Android security patch level via ADB
adb shell getprop ro.build.version.security_patch
# Expected output should be 2026-03-01 or later

# Check for pending security updates
adb shell pm list packages -U | grep com.google.android.gms