CVE-2022-49320 – This CVE addresses an integer overflow vulnerab... (How to Fix)

Q: What is the severity of CVE-2022-49320?

CVE-2022-49320 has a CVSS score of 5.5 (MEDIUM). This CVE addresses an integer overflow vulnerability in the ZynqMP DMA driver in the Linux kernel. The vulnerability could allow an attacker to cause a kernel panic or potentially execute arbitrary code by triggering memory allocation failures. It affects systems using Linux kernels with the vulnerable zynqmp_dma driver.

📋 TL;DR

This CVE addresses an integer overflow vulnerability in the ZynqMP DMA driver in the Linux kernel. The vulnerability could allow an attacker to cause a kernel panic or potentially execute arbitrary code by triggering memory allocation failures. It affects systems using Linux kernels with the vulnerable zynqmp_dma driver.

💻 Affected Systems

Products:

Linux kernel with zynqmp_dma driver

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

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ✅ No

Notes: Only vulnerable if the zynqmp_dma driver is loaded (typically on Xilinx Zynq UltraScale+ MPSoC systems)

📦 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 →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Kernel panic leading to denial of service, or potential arbitrary code execution with kernel privileges if combined with other vulnerabilities.

🟠

Likely Case

System crash or instability when specific DMA operations are performed, resulting in denial of service.

🟢

If Mitigated

No impact if the vulnerable driver is not loaded or the specific code path is not triggered.

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

🏢 Internal Only: MEDIUM - Could be exploited by malicious local users or through other compromised services.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires triggering specific DMA allocation operations; no known public exploits.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Fixed in kernel commits: 4838969e4d95d2bd2995d1605b20d3144fcb3e74, 7b5488f4721fed6e121e661e165bab06ae2f8675, 83960276ffc9bf5570d4106490346b61e61be5f3, 90aefae2e3a770a6909d339f5d8a988c0b0ceaf0, 95a0ba85c1b51b36e909841c02d205cd223ab753

Vendor Advisory: https://git.kernel.org/stable/c/4838969e4d95d2bd2995d1605b20d3144fcb3e74

Restart Required: Yes

Instructions:

1. Update Linux kernel to version containing the fix commits. 2. Reboot system to load patched kernel. 3. Verify zynqmp_dma driver is not causing issues.

🔧 Temporary Workarounds

Disable zynqmp_dma driver

linux

Prevent loading of vulnerable driver module

echo 'blacklist zynqmp_dma' >> /etc/modprobe.d/blacklist.conf
rmmod zynqmp_dma

🧯 If You Can't Patch

Restrict access to system to prevent local exploitation
Monitor system logs for DMA-related errors or crashes

🔍 How to Verify

Check if Vulnerable:

Check if zynqmp_dma driver is loaded: lsmod | grep zynqmp_dma, then check kernel version against patched versions

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits and zynqmp_dma driver loads without errors

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
DMA allocation failures in dmesg
System crash reports

Network Indicators:

None - local vulnerability

SIEM Query:

source="kernel" AND ("zynqmp_dma" OR "DMA allocation failed" OR "kernel panic")

📊 Metadata

CVE ID: CVE-2022-49320

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

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

Published: February 26, 2025

Last Updated: September 22, 2025

🔗 References

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🔗 Related Vulnerabilities

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