CVE-2025-22114
📋 TL;DR
A logic error in the Linux kernel's Btrfs filesystem validation function could allow mounting of invalid filesystems that should have been rejected. This affects Linux systems using Btrfs filesystems, potentially leading to data corruption or system instability.
💻 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 →⚠️ Risk & Real-World Impact
Worst Case
Mounting a corrupted Btrfs filesystem could lead to data loss, filesystem corruption, or kernel panics when accessing invalid data structures.
Likely Case
System administrators might inadvertently mount corrupted filesystems that appear functional but could experience data corruption or crashes during normal operations.
If Mitigated
With proper monitoring and regular filesystem checks, the impact is limited to potential temporary system instability until the invalid mount is detected and corrected.
🎯 Exploit Status
Exploitation requires creating or obtaining a specially crafted invalid Btrfs filesystem and having sufficient privileges to mount it.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 9db9c7dd5b4e1d3205137a094805980082c37716 and ef6800a2015e706e9852a5ec15263fec9990d012
Vendor Advisory: https://git.kernel.org/stable/c/9db9c7dd5b4e1d3205137a094805980082c37716
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Avoid mounting untrusted Btrfs filesystems
linuxPrevent mounting of potentially corrupted Btrfs filesystems from untrusted sources
Use alternative filesystems
linuxTemporarily use ext4 or xfs instead of Btrfs for critical systems
🧯 If You Can't Patch
- Implement strict access controls to prevent mounting of untrusted filesystems
- Regularly run btrfs check on all Btrfs filesystems to detect corruption early
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if it's between affected commits: uname -r and examine kernel changelogCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits or is newer than the patched versions📡 Detection & Monitoring
Log Indicators:
- Kernel logs showing Btrfs mount errors or corruption warnings
- System logs showing unexpected filesystem mounting
SIEM Query:
source="kernel" AND ("btrfs" AND ("mount" OR "corrupt" OR "invalid"))