CVE-2022-28348
📋 TL;DR
This vulnerability in Arm Mali GPU kernel drivers allows improper GPU memory operations to reach a use-after-free situation. Attackers can exploit this to potentially execute arbitrary code with kernel privileges on affected devices. This affects devices using Arm Mali GPU drivers across multiple architectures (Midgard, Bifrost, Valhall).
💻 Affected Systems
- Arm Mali GPU Kernel Driver
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with kernel-level code execution, allowing attackers to bypass all security controls, install persistent malware, access all system data, and potentially brick devices.
Likely Case
Privilege escalation from user to kernel space, enabling data theft, surveillance, or installation of backdoors on affected mobile/embedded devices.
If Mitigated
Limited impact if devices are fully patched, have strict app sandboxing, and lack local attack vectors through properly configured security policies.
🎯 Exploit Status
Exploitation requires local access or ability to run malicious code on device. No public exploit code available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Midgard r32p0+, Bifrost r37p0+, Valhall r37p0+
Vendor Advisory: https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20Vulnerabilities
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply latest firmware/OS update from device vendor. 3. For custom systems, update to patched Mali driver versions from Arm. 4. Reboot device after update.
🔧 Temporary Workarounds
Restrict GPU access
linuxLimit GPU driver access through SELinux/AppArmor policies to reduce attack surface
# Configure SELinux policies to restrict mali device access
# Example: setenforce 1
# Add custom SELinux rules for /dev/mali* devices
Application sandboxing
allEnforce strict app sandboxing to prevent malicious apps from accessing GPU drivers
# Android: Ensure Verify Apps is enabled
# Linux: Use containerization for untrusted apps
🧯 If You Can't Patch
- Implement strict application vetting and only install apps from trusted sources
- Deploy network segmentation to isolate vulnerable devices from critical systems
🔍 How to Verify
Check if Vulnerable:
Check GPU driver version via: cat /sys/class/misc/mali0/device/driver/version or dmesg | grep -i maliCheck Version:
cat /sys/class/misc/mali0/device/driver/version 2>/dev/null || dmesg | grep -i 'mali.*driver' | head -5Verify Fix Applied:
Verify driver version is patched (Midgard ≥r32p0, Bifrost ≥r37p0, Valhall ≥r37p0) and check for absence of CVE-2022-28348 in security bulletins📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages related to mali driver
- Unexpected GPU memory allocation failures
- SELinux/AppArmor denials for mali device access
Network Indicators:
- Unusual outbound connections from embedded devices
- Anomalous traffic patterns from IoT devices
SIEM Query:
source="kernel" AND ("mali" OR "gpu") AND ("panic" OR "oops" OR "use-after-free")