CVE-2025-38315
📋 TL;DR
A stack buffer overflow vulnerability in the Linux kernel's Bluetooth Intel driver allows attackers to execute arbitrary code or cause denial of service. The vulnerability occurs when the driver incorrectly handles EFI variable data larger than expected. Systems running affected Linux kernel versions with Bluetooth hardware are at risk.
💻 Affected Systems
- Linux kernel
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially leading to full system compromise.
Likely Case
System crash or denial of service affecting Bluetooth functionality.
If Mitigated
Limited impact if Bluetooth is disabled or system has proper kernel protections.
🎯 Exploit Status
Requires local access and ability to modify EFI variables or trigger the vulnerable code path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel trees (commits: 3aa1dc3c9060e335e82e9c182bf3d1db29220b1b, 7b8526bb489780ccc0caffc446ecabec83cfe568, 9427f6081f37c795a8bd29d0ee72a4da3bd64af8)
Vendor Advisory: https://git.kernel.org/stable/c/3aa1dc3c9060e335e82e9c182bf3d1db29220b1b
Restart Required: Yes
Instructions:
1. Update to latest stable Linux kernel version containing the fix. 2. Reboot system to load new kernel. 3. Verify Bluetooth functionality remains operational.
🔧 Temporary Workarounds
Disable Bluetooth
linuxTemporarily disable Bluetooth functionality to prevent exploitation.
sudo systemctl stop bluetooth
sudo systemctl disable bluetooth
sudo rfkill block bluetooth
Remove Bluetooth kernel module
linuxUnload the vulnerable Bluetooth driver module.
sudo modprobe -r btintel
sudo modprobe -r bluetooth
🧯 If You Can't Patch
- Disable Bluetooth hardware in BIOS/UEFI settings
- Implement strict access controls to prevent local privilege escalation
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if Bluetooth Intel module is loaded: lsmod | grep btintelCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check dmesg for Bluetooth initialization without errors📡 Detection & Monitoring
Log Indicators:
- Kernel panic or oops messages related to Bluetooth
- System crashes when Bluetooth is enabled
- EFI variable access errors in kernel logs
Network Indicators:
- Unusual Bluetooth connection attempts
- Bluetooth service crashes
SIEM Query:
source="kernel" AND ("btintel" OR "Bluetooth") AND ("panic" OR "oops" OR "segfault")