CVE-2023-53520
📋 TL;DR
A race condition vulnerability in the Linux kernel's Bluetooth subsystem allows a use-after-free scenario when the system suspends while Bluetooth devices are being unregistered. This can cause kernel crashes leading to denial of service. Systems running affected Linux kernel versions with Bluetooth enabled are vulnerable.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, potentially requiring physical reboot.
Likely Case
System instability or crash during suspend/resume operations when Bluetooth devices are active.
If Mitigated
Minor system instability that may require manual intervention to recover.
🎯 Exploit Status
Requires specific timing conditions during system suspend while Bluetooth devices are being unregistered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel branches via provided git commits
Vendor Advisory: https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Apply specific kernel patch if compiling from source. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable Bluetooth
linuxDisable Bluetooth functionality to prevent the race condition from being triggered
sudo systemctl stop bluetooth
sudo systemctl disable bluetooth
sudo rfkill block bluetooth
🧯 If You Can't Patch
- Disable Bluetooth functionality when not in use
- Avoid system suspend operations while Bluetooth devices are connected or being managed
🔍 How to Verify
Check if Vulnerable:
Check kernel version and compare with patched versions from distribution security advisoriesCheck Version:
uname -rVerify Fix Applied:
Verify kernel version after update matches patched version, check that Bluetooth suspend/resume operations work without crashes📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg output
- Bluetooth subsystem crash logs
- System suspend/resume failure logs
Network Indicators:
- None - this is a local kernel vulnerability
SIEM Query:
Search for kernel panic events or Bluetooth subsystem crashes during system suspend operations