CVE-2022-49425 – This CVE describes a use-after-free vulnerabili... (How to Fix)

Q: What is the severity of CVE-2022-49425?

CVE-2022-49425 has a CVSS score of 5.5 (MEDIUM). This CVE describes a use-after-free vulnerability in the Linux kernel's F2FS filesystem driver where a stale list iterator pointer could be dereferenced after a loop. This could allow local attackers to cause kernel crashes or potentially execute arbitrary code with kernel privileges. Systems using F2FS filesystem with vulnerable kernel versions are affected.

📋 TL;DR

This CVE describes a use-after-free vulnerability in the Linux kernel's F2FS filesystem driver where a stale list iterator pointer could be dereferenced after a loop. This could allow local attackers to cause kernel crashes or potentially execute arbitrary code with kernel privileges. Systems using F2FS filesystem with vulnerable kernel versions are affected.

💻 Affected Systems

Products:

Linux kernel

Versions: Kernel versions with F2FS support before fixes were applied (specific versions in git commits provided)

Operating Systems: Linux distributions using F2FS filesystem

Default Config Vulnerable: ✅ No

Notes: Only affects systems using F2FS filesystem. Most Linux distributions don't use F2FS by default.

📦 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 →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Local privilege escalation to kernel-level code execution, potentially leading to full system compromise.

🟠

Likely Case

Kernel panic leading to system crash and denial of service.

🟢

If Mitigated

Limited impact with proper kernel hardening and SELinux/AppArmor protections in place.

🌐 Internet-Facing: LOW - Requires local access to exploit.

🏢 Internal Only: MEDIUM - Local users or compromised accounts could exploit this vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Requires local access and knowledge of kernel exploitation techniques. No public exploits known at this time.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions with commits: 2aaf51dd39afb6d01d13f1e6fe20b684733b37d5, 385edd3ce5b4b1e9d31f474a5e35a39779ec1110, 45b2b7d7108ae1e25a5036cab04ab9273e792332, 51d584704d18e60fa473823654f35611c777b291, 5e47a7add3dda7f236548c5ec3017776dc2a729f

Vendor Advisory: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from your distribution's repositories. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.

🔧 Temporary Workarounds

Disable F2FS filesystem

linux

Prevent loading of F2FS kernel module to eliminate attack surface

echo 'install f2fs /bin/false' >> /etc/modprobe.d/f2fs-blacklist.conf
rmmod f2fs

🧯 If You Can't Patch

Implement strict access controls to limit local user privileges
Enable kernel hardening features like SELinux or AppArmor with strict policies

🔍 How to Verify

Check if Vulnerable:

Check if F2FS module is loaded: lsmod | grep f2fs AND check kernel version against patched versions

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated and F2FS module version includes the fix commits

📡 Detection & Monitoring

Log Indicators:

Kernel panic logs
OOPs messages in /var/log/kern.log or dmesg

Network Indicators:

None - local exploit only

SIEM Query:

source="kernel" AND ("Oops" OR "kernel panic" OR "general protection fault")

📊 Metadata

CVE ID: CVE-2022-49425

CVSS v3 Score: 5.5 (MEDIUM)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-476

EPSS Score: 0.04% exploit probability (10.1th percentile)

Published: February 26, 2025

Last Updated: October 22, 2025

🔗 References

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