CVE-2022-46892
📋 TL;DR
This vulnerability allows an operating system to reinitialize a disabled root complex in Ampere Altra and AltraMax processors, bypassing intended security controls. This affects systems using these processors where the root complex has been disabled for security isolation. Attackers could potentially gain unauthorized access to hardware resources.
💻 Affected Systems
- Ampere Altra
- Ampere AltraMax
📦 What is this software?
Ampere Altra Firmware by Amperecomputing
Ampere Altra Max Firmware by Amperecomputing
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to bypass hardware security boundaries, access protected memory regions, and potentially execute arbitrary code at the highest privilege levels.
Likely Case
Unauthorized access to hardware resources that should be isolated, potentially leading to data leakage or privilege escalation within the system.
If Mitigated
Limited impact if proper access controls and monitoring are in place, though the vulnerability still represents a significant security boundary violation.
🎯 Exploit Status
Exploitation requires OS-level access and knowledge of the specific hardware configuration. No public exploits have been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.10c
Vendor Advisory: https://amperecomputing.com/products/security-bulletins/root-complex-OS-re-enable
Restart Required: Yes
Instructions:
1. Download firmware update from Ampere support portal. 2. Follow vendor-specific firmware update procedures for your system. 3. Reboot system after update completes. 4. Verify firmware version is 2.10c or later.
🔧 Temporary Workarounds
Disable root complex features
allIf root complex isolation is not required, disable these features to remove the attack surface
Check system documentation for BIOS/UEFI settings to disable root complex features
🧯 If You Can't Patch
- Implement strict access controls to limit who can access systems with affected processors
- Monitor for unusual hardware access patterns and implement network segmentation for affected systems
🔍 How to Verify
Check if Vulnerable:
Check processor firmware version using vendor-specific tools or BIOS/UEFI interfaceCheck Version:
Check system BIOS/UEFI or use vendor-specific firmware query toolsVerify Fix Applied:
Verify firmware version is 2.10c or later using system management tools📡 Detection & Monitoring
Log Indicators:
- Unexpected root complex initialization events
- Hardware access violations
- Firmware modification attempts
Network Indicators:
- Unusual hardware management traffic
- Unexpected firmware update attempts
SIEM Query:
Search for hardware access events or firmware modification logs from affected systems