CVE-2025-58344
📋 TL;DR
This vulnerability allows attackers to cause kernel memory exhaustion through unbounded memory allocation in the Wi-Fi driver's /proc/driver/unifi0/conn_log_event_burst_to_us write operation. It affects Samsung Exynos processors used in mobile devices and wearables. Successful exploitation can lead to denial of service or potentially kernel crashes.
💻 Affected Systems
- Samsung Mobile Processor Exynos 980
- Samsung Mobile Processor Exynos 850
- Samsung Mobile Processor Exynos 1080
- Samsung Mobile Processor Exynos 1280
- Samsung Mobile Processor Exynos 1330
- Samsung Mobile Processor Exynos 1380
- Samsung Mobile Processor Exynos 1480
- Samsung Mobile Processor Exynos 1580
- Samsung Wearable Processor Exynos W920
- Samsung Wearable Processor Exynos W930
- Samsung Wearable Processor Exynos W1000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system crash or kernel panic requiring hard reboot, potentially causing data loss and extended service disruption.
Likely Case
Device becomes unresponsive or reboots due to kernel memory exhaustion, disrupting Wi-Fi connectivity and device functionality.
If Mitigated
Limited impact with proper memory management controls, but still potential for temporary service disruption.
🎯 Exploit Status
Exploitation requires write access to /proc/driver/unifi0/conn_log_event_burst_to_us, which typically requires elevated privileges. The vulnerability is straightforward to trigger once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Samsung security updates for specific device/OS versions
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2025-58344/
Restart Required: Yes
Instructions:
1. Check for security updates from device manufacturer. 2. Apply the latest firmware/OS update. 3. Reboot device after update installation. 4. Verify patch is applied through version checks.
🔧 Temporary Workarounds
Restrict /proc access
linuxLimit access to /proc/driver/unifi0 directory to prevent unauthorized writes
chmod 600 /proc/driver/unifi0/conn_log_event_burst_to_us
chown root:root /proc/driver/unifi0/conn_log_event_burst_to_us
Disable debug logging
linuxDisable Wi-Fi driver debug logging features if available
echo 0 > /proc/driver/unifi0/debug_level
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized users from accessing /proc filesystem
- Monitor system memory usage and kernel logs for signs of memory exhaustion attacks
🔍 How to Verify
Check if Vulnerable:
Check if /proc/driver/unifi0/conn_log_event_burst_to_us exists and is writable by non-root usersCheck Version:
getprop ro.build.fingerprint (Android) or uname -a (Linux kernel)Verify Fix Applied:
Check device firmware version against patched versions in Samsung security advisory📡 Detection & Monitoring
Log Indicators:
- Kernel OOM (Out of Memory) messages
- Wi-Fi driver crash logs
- Abnormal memory allocation patterns in kernel logs
Network Indicators:
- Sudden Wi-Fi disconnections
- Unusual Wi-Fi driver restarts
SIEM Query:
source="kernel" AND ("out of memory" OR "OOM" OR "unifi0")