CVE-2025-21485
📋 TL;DR
This vulnerability allows memory corruption through improper handling of INIT and multimode invoke IOCTL calls in FastRPC. Attackers could potentially execute arbitrary code or cause denial of service. This affects devices using Qualcomm chipsets with vulnerable FastRPC implementations.
💻 Affected Systems
- Qualcomm chipsets with FastRPC functionality
📦 What is this software?
Snapdragon 8 Gen 3 Mobile Platform Firmware by Qualcomm
View all CVEs affecting Snapdragon 8 Gen 3 Mobile Platform Firmware →
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with kernel privileges leading to complete system compromise
Likely Case
Local privilege escalation or denial of service affecting device stability
If Mitigated
Limited impact with proper access controls and isolation mechanisms in place
🎯 Exploit Status
Requires local access or ability to execute code in context with FastRPC access
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Qualcomm June 2025 security bulletin for specific versions
Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/june-2025-bulletin.html
Restart Required: Yes
Instructions:
1. Check Qualcomm advisory for affected chipset versions. 2. Obtain firmware/software updates from device manufacturer. 3. Apply patches following manufacturer instructions. 4. Reboot device to activate fixes.
🔧 Temporary Workarounds
Restrict FastRPC access
linuxLimit which applications/services can access FastRPC functionality
# Review and modify SELinux/AppArmor policies for FastRPC
# Check /dev/fastrpc permissions and restrict as needed
🧯 If You Can't Patch
- Implement strict application sandboxing to limit FastRPC access
- Monitor for abnormal FastRPC usage patterns and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check chipset version and compare against Qualcomm advisory; examine FastRPC module version if accessibleCheck Version:
# For Android: getprop ro.boot.hardware.sku
# Check device-specific commands for chipset versionVerify Fix Applied:
Verify firmware/software version matches patched versions in Qualcomm bulletin📡 Detection & Monitoring
Log Indicators:
- Unusual FastRPC IOCTL calls
- Kernel panic or crash logs related to FastRPC
- Privilege escalation attempts
Network Indicators:
- Not typically network-exploitable; focus on local system indicators
SIEM Query:
source="kernel" AND ("fastrpc" OR "CVE-2025-21485")