CVE-2022-22706
📋 TL;DR
This vulnerability in Arm Mali GPU Kernel Driver allows non-privileged users to write to read-only memory pages, potentially leading to privilege escalation or system compromise. It affects devices using Mali GPU drivers across Midgard, Bifrost, and Valhall architectures. This impacts Android devices, embedded systems, and other devices using these GPU drivers.
💻 Affected Systems
- Arm Mali GPU Kernel Driver
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise including kernel-level code execution, privilege escalation to root, and complete device takeover.
Likely Case
Privilege escalation allowing attackers to gain elevated permissions, potentially leading to data theft, persistence, or further exploitation.
If Mitigated
Limited impact if proper sandboxing and SELinux/apparmor policies are enforced, though kernel-level access remains dangerous.
🎯 Exploit Status
Exploitation requires local access but has been weaponized in real attacks. CISA lists this as known exploited.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Midgard r32p0+, Bifrost r36p0+, Valhall r36p0+
Vendor Advisory: https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver
Restart Required: Yes
Instructions:
1. Check current Mali driver version. 2. Obtain updated kernel/driver from device manufacturer or Arm. 3. Apply kernel/driver update. 4. Reboot device. 5. Verify updated version is running.
🔧 Temporary Workarounds
Restrict GPU access
linuxLimit GPU driver access through SELinux/apparmor policies to reduce attack surface
# Configure SELinux/apparmor to restrict GPU device access
# Example: setenforce 1 to enforce SELinux policies
Disable unnecessary GPU features
linuxDisable GPU features not required for your use case to reduce attack surface
# Modify kernel parameters or driver configuration
# Consult device-specific documentation
🧯 If You Can't Patch
- Implement strict application sandboxing and privilege separation
- Monitor for unusual GPU driver activity and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Mali driver version: cat /sys/kernel/debug/mali0/version or dmesg | grep -i maliCheck Version:
cat /sys/kernel/debug/mali0/version || dmesg | grep -i mali || modinfo maliVerify Fix Applied:
Verify driver version is patched: cat /sys/kernel/debug/mali0/version should show r32p0+ for Midgard, r36p0+ for Bifrost/Valhall📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing memory permission violations
- SELinux/apparmor denials for GPU driver access
- Unexpected privilege escalation attempts
Network Indicators:
- None - this is a local exploit
SIEM Query:
source="kernel" AND ("mali" OR "gpu") AND ("permission" OR "access denied" OR "segfault")🔗 References
- https://developer.arm.com/support/arm-security-updates
- https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver
- https://developer.arm.com/support/arm-security-updates
- https://developer.arm.com/support/arm-security-updates/mali-gpu-kernel-driver
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-22706
