CVE-2025-58340
📋 TL;DR
This vulnerability in Samsung Exynos Wi-Fi drivers allows attackers to cause kernel memory exhaustion through unbounded memory allocation. Attackers can trigger this by writing large buffers to /proc/driver/unifi0/send_delts, potentially leading to denial of service. This affects Samsung mobile and wearable devices using the listed Exynos processors.
💻 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 freeze requiring hard reboot, potentially disrupting device functionality and availability.
Likely Case
Local denial of service causing temporary device unresponsiveness or performance degradation.
If Mitigated
Minimal impact if proper access controls restrict write access to the vulnerable proc filesystem entry.
🎯 Exploit Status
Exploitation requires write access to the proc filesystem entry, which typically requires elevated privileges on Android systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Samsung security updates for specific device/OS versions
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2025-58340/
Restart Required: Yes
Instructions:
1. Check for security updates in device settings. 2. Apply available Samsung security patches. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict proc filesystem access
linuxLimit write access to /proc/driver/unifi0/send_delts to prevent exploitation
chmod 440 /proc/driver/unifi0/send_delts
chown root:root /proc/driver/unifi0/send_delts
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized write access to /proc/driver/unifi0/send_delts
- Monitor system logs for unusual memory allocation patterns or repeated access attempts to the vulnerable proc entry
🔍 How to Verify
Check if Vulnerable:
Check if /proc/driver/unifi0/send_delts exists and is writable by non-root usersCheck Version:
getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level includes CVE-2025-58340 fix and test that large writes to /proc/driver/unifi0/send_delts no longer cause memory exhaustion📡 Detection & Monitoring
Log Indicators:
- Kernel OOM (Out of Memory) events
- Unusual memory allocation patterns in kernel logs
- Repeated write operations to /proc/driver/unifi0/send_delts
Network Indicators:
- None - this is a local filesystem vulnerability
SIEM Query:
source="kernel" AND ("out of memory" OR "OOM" OR "/proc/driver/unifi0/send_delts")