CVE-2024-56567 – A division by zero vulnerability exists in the ... (How to Fix)

Q: What is the severity of CVE-2024-56567?

CVE-2024-56567 has a CVSS score of 5.5 (MEDIUM). A division by zero vulnerability exists in the Linux kernel's ad7780 driver when handling certain input values. This could cause kernel crashes or system instability on systems using affected AD7780 analog-to-digital converter hardware. The vulnerability affects Linux systems with the ad7780 driver loaded.

📋 TL;DR

A division by zero vulnerability exists in the Linux kernel's ad7780 driver when handling certain input values. This could cause kernel crashes or system instability on systems using affected AD7780 analog-to-digital converter hardware. The vulnerability affects Linux systems with the ad7780 driver loaded.

💻 Affected Systems

Products:

Linux kernel with ad7780 driver

Versions: Linux kernel versions before the fix commits (specific versions vary by distribution)

Operating Systems: Linux distributions using vulnerable kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable when ad7780 driver is loaded (typically requires AD7780 hardware or manual loading)

📦 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...

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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 and denial of service, potentially requiring physical reboot of affected systems.

🟠

Likely Case

System instability or kernel crash when specific operations are performed on AD7780 hardware, resulting in temporary denial of service.

🟢

If Mitigated

No impact if the ad7780 driver is not loaded or AD7780 hardware is not present.

🌐 Internet-Facing: LOW - This is a local kernel driver vulnerability requiring local access or specific hardware interaction.

🏢 Internal Only: MEDIUM - Could affect systems with AD7780 hardware in industrial or embedded environments, potentially causing operational disruption.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access and ability to trigger specific driver operations on AD7780 hardware

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Fixed in kernel commits: 022e13518ba6cc1b4fdd291f49e4f57b2d5718e0, 18fb33df1de83a014d7f784089f9b124facc157f, 68e79b848196a0b0ec006009cc69da1f835d1ae8, 7e3a8ea3d1ada7f707de5d9d504774b4191eab66, afc1e3c00b3f5f0b4f1bc3e974fb9803cb938a90

Vendor Advisory: https://git.kernel.org/stable/c/022e13518ba6cc1b4fdd291f49e4f57b2d5718e0

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing fix commits. 2. Reboot system. 3. Verify ad7780 driver is not vulnerable by checking kernel version.

🔧 Temporary Workarounds

Unload ad7780 driver

linux

Prevent driver loading if AD7780 hardware is not required

sudo rmmod ad7780

Blacklist ad7780 module

linux

Prevent automatic loading of vulnerable driver

echo 'blacklist ad7780' | sudo tee /etc/modprobe.d/blacklist-ad7780.conf

🧯 If You Can't Patch

Unload ad7780 driver if not needed for system operation
Restrict access to systems with AD7780 hardware to trusted users only

🔍 How to Verify

Check if Vulnerable:

Check if ad7780 module is loaded: lsmod | grep ad7780 AND check kernel version against patched versions

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits and ad7780 module loads without errors

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
Division by zero errors in kernel logs
System crash/reboot events

Network Indicators:

None - local vulnerability only

SIEM Query:

source="kernel" AND ("division by zero" OR "panic" OR "ad7780")

📊 Metadata

CVE ID: CVE-2024-56567

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-369

Published: December 27, 2024

Last Updated: November 3, 2025

🔗 References

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🔗 Related Vulnerabilities

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