CVE-2025-38652
📋 TL;DR
A buffer overflow vulnerability in the Linux kernel's F2FS filesystem driver allows out-of-bounds memory access when mounting devices with paths exactly at the maximum length limit. This affects Linux systems using F2FS filesystem with specific device mounting scenarios. Attackers could potentially crash the kernel or execute arbitrary code.
💻 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 →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
System crash or kernel panic when mounting F2FS filesystems with specific device path lengths, causing denial of service.
If Mitigated
System remains stable with proper patching; unpatched systems may experience crashes only under specific mounting conditions.
🎯 Exploit Status
Exploitation requires local access and ability to mount F2FS filesystems with specific path lengths; not trivial but possible for privileged users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 1b1efa5f0e878745e94a98022e8edc675a87d78e or later
Vendor Advisory: https://git.kernel.org/stable/c/1b1efa5f0e878745e94a98022e8edc675a87d78e
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix. 2. For distributions: Use package manager (apt/yum/dnf) to update kernel. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Avoid long device paths
linuxPrevent mounting F2FS devices with paths exactly 63 characters long
Disable F2FS module
linuxRemove or blacklist F2FS kernel module if not needed
echo 'blacklist f2fs' >> /etc/modprobe.d/blacklist-f2fs.conf
rmmod f2fs
🧯 If You Can't Patch
- Restrict F2FS mounting to trusted users only using filesystem permissions
- Monitor system logs for F2FS mounting attempts with long device paths
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if F2FS is loaded: uname -r && lsmod | grep f2fsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits or is newer than vulnerable versions📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- F2FS mount failures with device path errors
- System crashes during F2FS operations
SIEM Query:
source="kernel" AND ("F2FS" OR "f2fs") AND ("panic" OR "crash" OR "mount failed")🔗 References
- https://git.kernel.org/stable/c/1b1efa5f0e878745e94a98022e8edc675a87d78e
- https://git.kernel.org/stable/c/1cf1ff15f262e8baf12201b270b6a79f9d119b2d
- https://git.kernel.org/stable/c/345fc8d1838f3f8be7c8ed08d86a13dedef67136
- https://git.kernel.org/stable/c/3466721f06edff834f99d9f49f23eabc6b2cb78e
- https://git.kernel.org/stable/c/5661998536af52848cc4d52a377e90368196edea
- https://git.kernel.org/stable/c/666b7cf6ac9aa074b8319a2b68cba7f2c30023f0
- https://git.kernel.org/stable/c/70849d33130a2cf1d6010069ed200669c8651fbd
- https://git.kernel.org/stable/c/755427093e4294ac111c3f9e40d53f681a0fbdaa
- https://git.kernel.org/stable/c/dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
