CVE-2025-21436
📋 TL;DR
This CVE describes a use-after-free vulnerability in Qualcomm drivers where simultaneous IOCTL calls from different threads can cause memory corruption. This could allow local attackers to escalate privileges or execute arbitrary code. Affected systems include devices with vulnerable Qualcomm components.
💻 Affected Systems
- Qualcomm chipsets and associated drivers
📦 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
Local privilege escalation to kernel-level access leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to gain elevated permissions on the affected system.
If Mitigated
Denial of service or system instability if memory corruption occurs but exploitation fails.
🎯 Exploit Status
Requires local access and race condition timing; CVSS 7.8 suggests significant but not trivial exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Qualcomm April 2025 security bulletin for specific patched versions
Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2025-bulletin.html
Restart Required: Yes
Instructions:
1. Check Qualcomm advisory for affected components. 2. Obtain patches from device manufacturer or Qualcomm. 3. Apply patches according to vendor instructions. 4. Reboot system.
🔧 Temporary Workarounds
Restrict local user access
allLimit local user accounts and implement least privilege to reduce attack surface
Disable unnecessary drivers
linuxIf possible, disable or blacklist vulnerable Qualcomm drivers not required for operation
echo 'blacklist vulnerable_driver' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Implement strict access controls and monitor for suspicious local privilege escalation attempts
- Isolate affected systems from critical networks and implement application allowlisting
🔍 How to Verify
Check if Vulnerable:
Check system for Qualcomm components and compare versions against Qualcomm advisoryCheck Version:
Check driver versions via 'lsmod | grep qualcomm' or manufacturer-specific toolsVerify Fix Applied:
Verify patched driver versions are installed and system has been rebooted📡 Detection & Monitoring
Log Indicators:
- Multiple simultaneous IOCTL calls from same process
- Driver crash logs
- Unexpected privilege escalation events
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Process monitoring for unusual driver access patterns or privilege escalation