CVE-2025-26783
📋 TL;DR
A vulnerability in Samsung's RRC (Radio Resource Control) implementation across multiple Exynos processors allows incorrect handling of undefined values, leading to Denial of Service. This affects Samsung mobile devices, wearables, and modems using the listed Exynos chipsets. Attackers could potentially crash or disrupt cellular connectivity on affected devices.
💻 Affected Systems
- Samsung Mobile Processor
- Samsung Wearable Processor
- Samsung Modem
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete loss of cellular connectivity on affected devices, rendering them unable to make calls, send messages, or use mobile data until rebooted or patched.
Likely Case
Temporary disruption of cellular services, dropped calls, or degraded network performance on vulnerable devices.
If Mitigated
Minimal impact with proper network segmentation and monitoring; isolated to individual devices rather than network-wide disruption.
🎯 Exploit Status
Exploitation requires sending malformed RRC messages to the target device, which could be achieved through base station spoofing or proximity attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Samsung security updates for specific device models
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2025-26783/
Restart Required: Yes
Instructions:
1. Check for available security updates in device Settings
2. Apply the latest Samsung security patch
3. Reboot device after update installation
4. Verify patch installation in About Phone > Software Information
🔧 Temporary Workarounds
Disable vulnerable cellular bands
androidTemporarily disable cellular connectivity or switch to Wi-Fi calling to reduce attack surface
Settings > Connections > Mobile Networks > Network Mode > Select LTE only or 3G only (varies by device)
🧯 If You Can't Patch
- Isolate vulnerable devices on separate network segments
- Implement network monitoring for abnormal RRC protocol traffic
🔍 How to Verify
Check if Vulnerable:
Check device model and chipset in Settings > About Phone > Hardware InformationCheck Version:
adb shell getprop ro.boot.hardware (for Exynos chipset check)Verify Fix Applied:
Verify security patch level in Settings > About Phone > Software Information matches or exceeds patch date in Samsung advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected RRC protocol errors
- Modem crash logs
- Radio interface layer failures
Network Indicators:
- Abnormal RRC signaling patterns
- Unexpected RRC connection releases
- Malformed RRC messages
SIEM Query:
source="android_logs" AND ("RRC error" OR "modem crash" OR "ril failure")