CVE-2024-53146 – This CVE describes an integer overflow vulnerab... (How to Fix)

Q: What is the severity of CVE-2024-53146?

CVE-2024-53146 has a CVSS score of 5.5 (MEDIUM). This CVE describes an integer overflow vulnerability in the Linux kernel's NFSD (Network File System Daemon) component. If exploited, it could allow attackers to cause denial of service or potentially execute arbitrary code on systems running vulnerable kernel versions. The vulnerability affects Linux systems with NFSD enabled.

📋 TL;DR

This CVE describes an integer overflow vulnerability in the Linux kernel's NFSD (Network File System Daemon) component. If exploited, it could allow attackers to cause denial of service or potentially execute arbitrary code on systems running vulnerable kernel versions. The vulnerability affects Linux systems with NFSD enabled.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific vulnerable kernel versions referenced in the git commits (exact ranges depend on distribution backports)

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable if NFSD is enabled and running. Many systems disable NFSD 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 →

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

Remote code execution leading to full system compromise if the integer overflow enables memory corruption that can be leveraged for privilege escalation.

🟠

Likely Case

Denial of service through kernel panic or system crash, disrupting NFS services and potentially affecting system stability.

🟢

If Mitigated

Limited impact with proper network segmentation and NFS access controls, potentially only affecting NFS service availability.

🌐 Internet-Facing: MEDIUM - NFS services exposed to the internet are vulnerable, but NFS is typically used internally.

🏢 Internal Only: MEDIUM - Internal NFS servers are vulnerable to attacks from compromised internal systems or malicious insiders.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires sending specially crafted NFS requests to trigger the integer overflow condition.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions containing commits 084f797dbc7e52209a4ab6dbc7f0109268754eb9 or related fixes

Vendor Advisory: https://git.kernel.org/stable/c/084f797dbc7e52209a4ab6dbc7f0109268754eb9

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 NFSD service is running correctly post-update.

🔧 Temporary Workarounds

Disable NFSD service

linux

Stop and disable the NFS server daemon if not required

systemctl stop nfs-server
systemctl disable nfs-server

Restrict NFS access with firewall

linux

Block external access to NFS ports (2049/tcp, 2049/udp)

iptables -A INPUT -p tcp --dport 2049 -j DROP
iptables -A INPUT -p udp --dport 2049 -j DROP

🧯 If You Can't Patch

Implement strict network segmentation to isolate NFS servers from untrusted networks
Use host-based firewalls to restrict NFS access to only trusted client IP addresses

🔍 How to Verify

Check if Vulnerable:

Check kernel version and verify if NFSD is running: 'uname -r' and 'systemctl status nfs-server'

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated and check git commit history for the fix: 'uname -r' and 'grep -i "084f797dbc7e52209a4ab6dbc7f0109268754eb9" /boot/config-$(uname -r)'

📡 Detection & Monitoring

Log Indicators:

Kernel panic logs
NFSD crash messages in system logs
Unexpected NFS connection attempts

Network Indicators:

Unusual NFS traffic patterns
Multiple connection attempts to port 2049

SIEM Query:

source="kernel" AND ("panic" OR "oops") OR source="nfsd" AND ("crash" OR "error")

📊 Metadata

CVE ID: CVE-2024-53146

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-190

Published: December 24, 2024

Last Updated: November 3, 2025

🔗 References

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