CVE-2025-21434
📋 TL;DR
This vulnerability allows a denial-of-service (DoS) condition in Wi-Fi systems when parsing EHT (Extremely High Throughput) operation or capability information elements. Attackers can send specially crafted packets to crash or degrade affected devices. This primarily impacts devices with Qualcomm Wi-Fi chipsets that support Wi-Fi 7 (802.11be) features.
💻 Affected Systems
- Qualcomm Wi-Fi chipsets supporting Wi-Fi 7 (802.11be)
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Permanent device crash requiring physical restart, disrupting critical network services and causing extended downtime.
Likely Case
Temporary service disruption with automatic recovery, causing intermittent connectivity issues for users.
If Mitigated
Minimal impact with proper network segmentation and monitoring, potentially causing brief packet loss.
🎯 Exploit Status
Exploitation requires sending malformed EHT information elements, which can be done via standard Wi-Fi packet injection tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm's April 2025 security bulletin for specific patched firmware versions.
Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2025-bulletin.html
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply Qualcomm-provided firmware patches. 3. Reboot affected devices. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable Wi-Fi 7/EHT features
linuxTemporarily disable 802.11be/EHT capabilities to prevent parsing of vulnerable information elements.
iw dev wlan0 set type managed
iw wlan0 set disable_eht 1
Network segmentation
allIsolate Wi-Fi 7 capable devices on separate VLANs to limit attack surface.
🧯 If You Can't Patch
- Implement strict network access controls to limit who can send management frames to affected devices.
- Deploy intrusion detection systems to monitor for malformed EHT information elements in Wi-Fi traffic.
🔍 How to Verify
Check if Vulnerable:
Check if device uses Qualcomm Wi-Fi chipset with Wi-Fi 7 support and has not applied April 2025 patches.Check Version:
cat /sys/class/net/wlan0/device/firmware_versionVerify Fix Applied:
Verify firmware version matches patched versions in Qualcomm advisory and test with EHT packet fuzzing.📡 Detection & Monitoring
Log Indicators:
- Kernel panics or driver crashes in system logs
- Wi-Fi interface resets or disconnections
Network Indicators:
- Malformed EHT information elements in Wi-Fi captures
- Excessive management frame traffic
SIEM Query:
source="kernel" AND ("panic" OR "oops") AND ("wlan" OR "wifi")