CVE-2025-37845
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's fprobe tracing subsystem. An attacker could exploit this to cause kernel crashes or potentially execute arbitrary code with kernel privileges. All Linux systems using affected kernel versions with fprobe tracing 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 →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
Kernel panic leading to system crash, or potential arbitrary code execution with kernel privileges resulting in complete system compromise.
Likely Case
Kernel panic causing system instability or denial of service, requiring system reboot.
If Mitigated
Minimal impact if fprobe tracing is disabled or systems are properly patched.
🎯 Exploit Status
Exploitation requires local access and ability to interact with kernel tracing subsystem. Timing window for UAF makes exploitation challenging.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check specific kernel versions containing commits: 626f01f4d26e8cf92e69c1df53036153c8e98a20, 868df4eb784c3ccc7e4340a9ea993cbbedca167e, a27d2de2472b1cc7d582ab405d1d5832a80481de, dd941507a9486252d6fcf11814387666792020f3
Vendor Advisory: https://git.kernel.org/stable/c/626f01f4d26e8cf92e69c1df53036153c8e98a20
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable fprobe tracing
linuxDisable the vulnerable fprobe tracing functionality to prevent exploitation
echo 0 > /sys/kernel/debug/tracing/events/fprobes/enable
🧯 If You Can't Patch
- Disable fprobe tracing functionality completely
- Implement strict access controls to prevent unauthorized users from loading kernel modules or accessing tracing interfaces
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if fprobe tracing is enabled: cat /sys/kernel/debug/tracing/events/fprobes/enableCheck Version:
uname -rVerify Fix Applied:
Verify kernel version contains the fix commits and fprobe tracing functions properly without crashes📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- OOPs (kernel crash) logs
- System crash/reboot events
Network Indicators:
- None - local vulnerability only
SIEM Query:
Search for kernel panic or OOPs messages in system logs