Deadlock Vulnerability in Linux Kernel's f2fs Package: Critical Shutdown Issue
Summary
DEBIAN-CVE-2024-40969: In the Linux kernel, the following vulnerability has been resolved: f2fs: don't set RO when shutting down f2fs Shutdown does not check the error of thaw_super due to readonly, which causes a deadlock like below. Affects linux versions < 6.9.7-1. Fixed in 6.9.7-1. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux kernel is a core component of many operating systems, providing essential services for hardware management and system resources. The f2fs (Flash-Friendly File System) is designed to optimize performance on flash storage devices. This package is integral for efficient data handling and storage management, but it is susceptible to vulnerabilities that can lead to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the f2fs module related to the shutdown process. Specifically, the issue arises when the system attempts to set the file system to read-only (RO) during shutdown without properly checking for errors from the thaw_super function. This oversight can lead to a deadlock situation, where the shutdown process hangs indefinitely, causing potential data loss and system unresponsiveness. The deadlock sequence involves multiple functions, including f2fs_ioc_shutdown and bdev_freeze, which can create a critical failure in the file system's operation.
How To Fix
Minimum fixed version
6.9.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. However, users are advised to avoid shutting down the system while the f2fs file system is in use until the patch is applied.
Conclusion
The identified vulnerability in the Linux kernel's f2fs package poses a significant risk during system shutdowns, leading to potential deadlocks and data loss. It is crucial for users to update to the patched version 6.9.7-1 or later to mitigate this risk. Regular monitoring and timely updates are essential for maintaining system integrity.
See every vulnerability recorded for linux →
FAQ
The vulnerability can lead to a deadlock during the shutdown process, potentially causing system crashes and data loss.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If an immediate update is not possible, avoid shutting down the system while using the f2fs file system to prevent encountering the deadlock.
Yes, the vulnerability affects specific versions of the Linux kernel prior to 6.9.7-1.
You can refer to the official Debian security advisories or the CVE database for detailed information on vulnerabilities affecting the Linux kernel.
References
Related vulnerabilities
Recent vulnerabilities recorded for linux.
