CVE-2025-38578
📋 TL;DR
This CVE describes a use-after-free vulnerability in the Linux kernel's F2FS filesystem driver, specifically in the f2fs_sync_inode_meta() function. An attacker could potentially exploit this to cause kernel memory corruption, leading to system crashes or privilege escalation. Systems using F2FS filesystems with affected Linux kernel versions are vulnerable.
💻 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 denial of service, or potential privilege escalation allowing full system compromise.
Likely Case
System crash or kernel panic causing denial of service.
If Mitigated
Limited impact if proper kernel hardening and isolation are implemented.
🎯 Exploit Status
Exploitation requires triggering specific F2FS filesystem operations. The vulnerability was discovered through syzkaller fuzzing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Multiple stable kernel versions with fixes available (see references)
Vendor Advisory: https://git.kernel.org/stable/c/1edf68272b8cba2b2817ef1488ecb9f0f84cb6a0
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable F2FS usage
allAvoid using F2FS filesystem until patched
# Check for F2FS mounts: mount | grep f2fs
# Unmount F2FS partitions if possible
🧯 If You Can't Patch
- Restrict local user access to minimize attack surface
- Implement kernel hardening features like KASAN and strict memory protections
🔍 How to Verify
Check if Vulnerable:
Check kernel version and F2FS usage: uname -r and mount | grep f2fsCheck Version:
uname -rVerify Fix Applied:
Verify kernel version is updated beyond affected versions and check for F2FS mount activity📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- KASAN reports of use-after-free in f2fs_sync_inode_meta()
- System crash dumps
Network Indicators:
- None - local vulnerability
SIEM Query:
Search for kernel panic events or f2fs-related crash reports in system logs🔗 References
- https://git.kernel.org/stable/c/1edf68272b8cba2b2817ef1488ecb9f0f84cb6a0
- https://git.kernel.org/stable/c/37e78cad7e9e025e63bb35bc200f44637b009bb1
- https://git.kernel.org/stable/c/3d37cadaac1a8e108e576297aab9125b24ea2dfe
- https://git.kernel.org/stable/c/4dcd830c420f2190ae32f03626039fde7b57b2ad
- https://git.kernel.org/stable/c/6cac47af39b2b8edbb41d47c3bd9c332f83e9932
- https://git.kernel.org/stable/c/7c30d79930132466f5be7d0b57add14d1a016bda
- https://git.kernel.org/stable/c/917ae5e280bc263f56c83fba0d0f0be2c4828083
- https://git.kernel.org/stable/c/a4b0cc9e0bba7525a29f37714e88df12a47997a2
- https://git.kernel.org/stable/c/dea243f58a8391e76f42ad5eb59ff210519ee772
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
