CVE-2021-35069
📋 TL;DR
This vulnerability allows improper validation of data length from DMA buffers, leading to memory corruption in Qualcomm Snapdragon chipsets. It affects multiple Snapdragon product lines including Auto, Compute, Mobile, and others. Attackers could potentially execute arbitrary code or cause denial of service.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wired Infrastructure and Networking
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, or persistent backdoor installation.
Likely Case
Denial of service (system crash/reboot) or limited information disclosure through memory corruption.
If Mitigated
No impact if patched or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploitation requires DMA access and understanding of chipset memory management; no public exploits known
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm February 2022 security bulletin for specific patch versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/february-2022-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply Qualcomm-provided patches through OEM updates. 3. Reboot device after update.
🔧 Temporary Workarounds
Disable DMA access
linuxRestrict DMA buffer access to trusted processes only
Device-specific configuration; consult manufacturer documentation
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks
- Implement strict access controls and monitoring for DMA operations
🔍 How to Verify
Check if Vulnerable:
Check device chipset version and compare against Qualcomm's affected list in February 2022 bulletinCheck Version:
Device-specific commands; typically 'cat /proc/cpuinfo' or manufacturer-specific firmware checkVerify Fix Applied:
Verify firmware version has been updated to post-February 2022 patch level📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Memory corruption errors in system logs
- Unexpected DMA operation patterns
Network Indicators:
- Unusual DMA-related network traffic patterns
SIEM Query:
Search for kernel panic events or memory corruption alerts on Snapdragon-based devices