CVE-2025-23130
📋 TL;DR
A race condition vulnerability in the Linux kernel's F2FS filesystem can cause a kernel panic when concurrent pinfile allocation operations fail due to insufficient free sections. This affects systems using the F2FS filesystem and can lead to denial of service.
💻 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 intervention to reboot affected systems.
Likely Case
System instability or crash when specific F2FS operations are performed concurrently under low disk space conditions.
If Mitigated
No impact if patched or if F2FS filesystem is not in use.
🎯 Exploit Status
Requires local access and ability to perform specific F2FS operations concurrently. Discovered through syzkaller fuzzing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in stable kernel releases (commits: 2dda0930fb79b847b4bfceb737577d0f6bc24d7d, 48ea8b200414ac69ea96f4c231f5c7ef1fbeffef, 9392862608d081a8346a3b841f862d732fce954b)
Vendor Advisory: https://git.kernel.org/stable/c/2dda0930fb79b847b4bfceb737577d0f6bc24d7d
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing fixes. 2. Check kernel version with 'uname -r'. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Avoid F2FS usage
linuxUse alternative filesystems like ext4 or XFS instead of F2FS
Monitor disk space
linuxEnsure adequate free space on F2FS partitions to prevent allocation failures
df -h | grep f2fs
🧯 If You Can't Patch
- Avoid using F2FS filesystem for critical systems
- Implement monitoring for kernel panic events and have recovery procedures ready
🔍 How to Verify
Check if Vulnerable:
Check if using F2FS: 'mount | grep f2fs' and check kernel version: 'uname -r' against affected versionsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated and check git commit history includes the fix commits📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/kern.log or dmesg output
- F2FS allocation failure errors
- System crash/reboot events
Network Indicators:
- None - local filesystem vulnerability
SIEM Query:
source="kernel" AND ("panic" OR "BUG" OR "f2fs" AND "allocation")