CVE-2022-22057
📋 TL;DR
This is a use-after-free vulnerability in Qualcomm's kgsl graphics driver that occurs due to a race condition when closing fence file descriptors while destroying graphics timelines simultaneously. Successful exploitation could allow local attackers to execute arbitrary code with kernel privileges. Affects devices using Snapdragon processors across automotive, compute, connectivity, IoT, mobile, and wearable platforms.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Wearables
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level code execution, allowing attackers to install persistent malware, bypass security controls, and access all system data.
Likely Case
Local privilege escalation from user to kernel mode, enabling attackers to gain full control over the affected device.
If Mitigated
Limited impact if proper kernel hardening, SELinux/apparmor policies, and privilege separation are implemented.
🎯 Exploit Status
Exploit requires local access and knowledge of race condition timing. Public exploit details available on Packet Storm.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2022 security updates and later
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/may-2022-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for available security updates. 2. Apply May 2022 or later Qualcomm security patches. 3. Update kernel graphics drivers. 4. Reboot device to load patched kernel.
🔧 Temporary Workarounds
Restrict graphics driver access
linuxLimit access to /dev/kgsl-* devices using SELinux/apparmor policies
chmod 600 /dev/kgsl-*
setenforce 1
🧯 If You Can't Patch
- Implement strict SELinux/apparmor policies to restrict access to graphics subsystem
- Monitor for unusual graphics driver activity and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check kernel version and Qualcomm security patch level: getprop ro.build.version.security_patchCheck Version:
uname -r && getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch date is May 2022 or later and check for updated kgsl driver version📡 Detection & Monitoring
Log Indicators:
- Kernel panic or crash logs related to kgsl driver
- Unusual privilege escalation attempts
- Multiple rapid open/close operations on /dev/kgsl-*
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="kernel" AND ("kgsl" OR "graphics_fence" OR "use-after-free")🔗 References
- http://packetstormsecurity.com/files/172850/Qualcomm-kgsl-Driver-Use-After-Free.html
- https://www.qualcomm.com/company/product-security/bulletins/may-2022-bulletin
- http://packetstormsecurity.com/files/172850/Qualcomm-kgsl-Driver-Use-After-Free.html
- https://www.qualcomm.com/company/product-security/bulletins/may-2022-bulletin
