CVE-2024-41935
📋 TL;DR
A race condition vulnerability in the Linux kernel's F2FS filesystem could cause kernel hangs when shrinking large extent trees. This affects Linux systems using the F2FS filesystem, potentially leading to denial of service. The vulnerability requires local access to trigger.
💻 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
Complete system hang requiring hard reboot, causing extended downtime and potential data corruption.
Likely Case
Temporary system unresponsiveness or performance degradation when F2FS operations are performed.
If Mitigated
Minor performance impact during F2FS operations with proper kernel version.
🎯 Exploit Status
Requires local access and ability to trigger F2FS extent tree operations. No known public exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits 295b50e95e900da31ff237e46e04525fa799b2cf, 3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343, or 924f7dd1e832e4e4530d14711db223d2803f7b61
Vendor Advisory: https://git.kernel.org/stable/c/295b50e95e900da31ff237e46e04525fa799b2cf
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Avoid F2FS usage
allUse alternative filesystems instead of F2FS where possible
Limit F2FS operations
allRestrict user access to F2FS filesystem operations
🧯 If You Can't Patch
- Monitor system for hangs or performance issues related to F2FS operations
- Implement strict access controls to limit who can perform filesystem operations
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if F2FS is in use. Vulnerable if using F2FS with kernel before fix commits.Check Version:
uname -rVerify Fix Applied:
Verify kernel version contains one of the fix commit hashes: 295b50e95e900da31ff237e46e04525fa799b2cf, 3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343, or 924f7dd1e832e4e4530d14711db223d2803f7b61📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- System hang events in system logs
- F2FS-related error messages
SIEM Query:
Search for kernel panic events or system hang alerts in system logs