CVE-2025-48543: Google Android Privilege Escalation Flaw

CVE-2025-48543 Overview

CVE-2025-48543 is a use-after-free vulnerability affecting Google Android that enables attackers to escape the Chrome sandbox and attack the Android system_server process. This memory corruption flaw allows for local privilege escalation without requiring additional execution privileges or user interaction. The vulnerability has been added to CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

Critical Impact

This vulnerability enables Chrome sandbox escape to attack Android system_server, leading to local privilege escalation without user interaction. Active exploitation has been observed.

Affected Products

• Google Android 13.0
• Google Android 14.0
• Google Android 15.0
• Google Android 16.0

Discovery Timeline

• September 4, 2025 - CVE-2025-48543 published to NVD
• October 23, 2025 - Last updated in NVD database

Technical Details for CVE-2025-48543

Vulnerability Analysis

This vulnerability (CWE-416: Use After Free) occurs in multiple locations within the Android platform, specifically affecting the Android Runtime (ART) component. The use-after-free condition allows an attacker operating within the Chrome sandbox to reference memory that has been freed, potentially corrupting data structures used by the system_server process.

The exploitation path is particularly dangerous because it bridges the Chrome sandbox boundary to target the system_server—the central Android process responsible for managing system services, permissions, and inter-process communication. By compromising system_server, an attacker can effectively gain control over the entire Android operating system with elevated privileges.

The local attack vector combined with low attack complexity and no user interaction requirement makes this vulnerability highly exploitable on vulnerable devices. The scope change indicator in the vulnerability assessment confirms that successful exploitation impacts resources beyond the vulnerable component itself.

Root Cause

The root cause is a use-after-free condition where memory is freed but subsequently accessed, allowing an attacker to manipulate the freed memory region. This type of vulnerability typically occurs when:

• An object is deallocated while a reference to it still exists
• The dangling reference is later dereferenced, accessing memory that may have been reallocated for other purposes
• An attacker can control the contents of the reallocated memory, leading to arbitrary code execution

The specific fix was committed to the Android ART component, indicating the vulnerability exists within the Android Runtime's memory management routines.

Attack Vector

The attack leverages local access to exploit the use-after-free condition from within the Chrome browser sandbox. The exploitation flow involves:

1. Triggering the use-after-free condition within Chrome's rendering or JavaScript engine
2. Manipulating the freed memory to gain control of execution flow
3. Escaping the Chrome sandbox by exploiting the corrupted memory state
4. Targeting the system_server process to achieve privilege escalation

The vulnerability mechanism involves exploitation of dangling pointer references after memory deallocation. When the freed memory region is subsequently accessed, attacker-controlled data can be interpreted as valid object pointers or function references, enabling arbitrary code execution. Technical details are available in the Android ART Commit Update and the Android Security Bulletin September 2025.

Detection Methods for CVE-2025-48543

Indicators of Compromise

• Abnormal process behavior or crashes in Chrome browser or system_server
• Unexpected privilege escalation attempts originating from Chrome processes
• Memory access violations or segmentation faults in Android Runtime logs
• Suspicious inter-process communication between Chrome and system services

Detection Strategies

• Monitor for unusual memory allocation patterns in Chrome and ART processes
• Implement runtime integrity checking for system_server process
• Deploy endpoint detection and response (EDR) solutions capable of detecting use-after-free exploitation attempts
• Enable Android's built-in exploit mitigation logging for ART components

Monitoring Recommendations

• Review system logs for system_server crashes or unexpected restarts
• Monitor for anomalous process spawning from Chrome browser processes
• Implement alerting for privilege escalation indicators on Android devices
• Track CISA KEV catalog updates via CISA Known Exploits CVE-2025-48543

How to Mitigate CVE-2025-48543

Immediate Actions Required

• Apply the September 2025 Android Security Patch immediately
• Prioritize patching given the confirmed active exploitation status
• Review mobile device management (MDM) policies to enforce security updates
• Consider restricting Chrome browser usage on unpatched devices until remediation

Patch Information

Google has released security patches addressing this vulnerability as part of the Android Security Bulletin September 2025. The specific fix for the ART component is available in commit 444fc40dfb04d2ec5f74c443ed3a4dd45d3131f2, accessible via the Android ART Commit Update.

Organizations should coordinate with device manufacturers and carriers to obtain the latest security patches for affected Android versions 13.0 through 16.0.

Workarounds

• Limit Chrome browser usage on vulnerable devices until patches are applied
• Implement application isolation policies via MDM solutions
• Consider using alternative browsers with enhanced sandboxing while awaiting patches
• Enable Android's work profile feature to isolate sensitive applications from potential exploitation

# Check Android security patch level via ADB
adb shell getprop ro.build.version.security_patch

# Expected output for patched devices: 2025-09-01 or later