CVE-2020-11309
📋 TL;DR
This CVE describes a use-after-free vulnerability in Qualcomm GPU drivers that allows attackers to execute arbitrary code or cause denial of service. The vulnerability affects multiple Qualcomm Snapdragon platforms across automotive, mobile, IoT, and wearable devices. Attackers can exploit this by tricking users into running malicious applications.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wearables
📦 What is this software?
Sd8c Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with kernel-level privileges, allowing complete control over affected devices, data theft, and persistent backdoor installation.
Likely Case
Local privilege escalation allowing malicious apps to gain elevated permissions, access sensitive data, or cause system instability and crashes.
If Mitigated
Limited impact with proper app sandboxing and security controls, potentially only causing application crashes without privilege escalation.
🎯 Exploit Status
Requires local access and ability to execute code; typical exploitation would involve malicious application with GPU access permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm March 2021 security bulletin for specific patched driver versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/march-2021-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for available updates 2. Apply GPU driver updates from device OEM 3. Apply full system updates if available 4. Reboot device after update installation
🔧 Temporary Workarounds
Restrict GPU driver permissions
linuxLimit which applications can access GPU functionality through SELinux/AppArmor policies
# Configure SELinux policies to restrict GPU access
# Example: semanage permissive -d gpu_domain_t
🧯 If You Can't Patch
- Implement strict application vetting and only install apps from trusted sources
- Use mobile device management (MDM) solutions to restrict app installations and monitor for suspicious behavior
🔍 How to Verify
Check if Vulnerable:
Check device model and GPU driver version against Qualcomm's affected products list in March 2021 bulletinCheck Version:
# Android: adb shell dmesg | grep -i gpu OR check Settings > About phone > Kernel versionVerify Fix Applied:
Verify GPU driver version has been updated to patched version specified in Qualcomm advisory📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- GPU driver crash reports
- SELinux/AppArmor denials for GPU access
Network Indicators:
- Unusual outbound connections from system processes post-GPU access
SIEM Query:
source="kernel" AND "GPU" AND ("panic" OR "crash" OR "use after free")