CVE-2025-27072
📋 TL;DR
This vulnerability allows information disclosure when processing Ethernet AVB (Audio Video Bridging) packets with invalid header lengths on Qualcomm chipsets. It affects devices using Qualcomm EAVB (Ethernet AVB) implementations, potentially exposing sensitive memory contents. The impact is limited to systems with EAVB functionality enabled.
💻 Affected Systems
- Qualcomm chipsets with EAVB (Ethernet AVB) functionality
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could read sensitive kernel memory or device configuration data, potentially leading to further exploitation or system compromise.
Likely Case
Limited information disclosure of non-critical memory regions, possibly revealing system state or configuration details.
If Mitigated
With proper network segmentation and access controls, impact is minimal as exploitation requires network access to EAVB interfaces.
🎯 Exploit Status
Exploitation requires sending specially crafted EAVB packets to vulnerable interfaces. No authentication needed but requires network access to EAVB endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm August 2025 security bulletin for chipset-specific patches
Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/august-2025-bulletin.html
Restart Required: Yes
Instructions:
1. Check Qualcomm advisory for your specific chipset. 2. Obtain firmware/driver updates from device manufacturer. 3. Apply patches according to manufacturer instructions. 4. Reboot system to load updated drivers.
🔧 Temporary Workarounds
Network Segmentation
allIsolate EAVB networks from untrusted networks using firewalls or VLANs
Disable EAVB if Unused
allDisable EAVB functionality if not required for system operation
Check device-specific documentation for EAVB disable commands
🧯 If You Can't Patch
- Implement strict network access controls to EAVB interfaces
- Monitor EAVB network traffic for anomalous packets
🔍 How to Verify
Check if Vulnerable:
Check chipset version and EAVB driver version against Qualcomm advisory. Use 'cat /proc/cpuinfo' and check driver versions.Check Version:
Device-specific; typically 'cat /proc/version' or manufacturer-specific version commandsVerify Fix Applied:
Verify updated driver/firmware version matches patched versions in Qualcomm advisory.📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing EAVB errors or memory access violations
- System logs with driver crash/restart events
Network Indicators:
- Unusual EAVB packet patterns or malformed headers on EAVB interfaces
SIEM Query:
source="kernel" AND ("EAVB" OR "AVB") AND ("error" OR "invalid" OR "corrupt")