CVE-2022-50181 – This CVE describes a NULL pointer dereference v... (How to Fix)

Q: What is the severity of CVE-2022-50181?

CVE-2022-50181 has a CVSS score of 5.5 (MEDIUM). This CVE describes a NULL pointer dereference vulnerability in the Linux kernel's virtio-gpu driver. If exploited, it could cause a kernel panic leading to denial of service. The vulnerability affects systems using the virtio-gpu driver, particularly virtualized environments and cloud instances.

📋 TL;DR

This CVE describes a NULL pointer dereference vulnerability in the Linux kernel's virtio-gpu driver. If exploited, it could cause a kernel panic leading to denial of service. The vulnerability affects systems using the virtio-gpu driver, particularly virtualized environments and cloud instances.

💻 Affected Systems

Products:

Linux kernel

Versions: Specific kernel versions with the vulnerable virtio-gpu code (check git commits for exact ranges)

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems using virtio-gpu driver, common in virtualized environments (KVM, QEMU) and cloud instances.

📦 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 →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Kernel panic leading to system crash and denial of service, potentially disrupting all services on the affected system.

🟠

Likely Case

System crash requiring reboot, causing temporary service disruption in virtualized environments.

🟢

If Mitigated

Minimal impact with proper kernel hardening and isolation between virtual machines.

🌐 Internet-Facing: LOW - Requires local access or ability to interact with virtio-gpu driver, typically not exposed to internet.

🏢 Internal Only: MEDIUM - Virtualized environments and cloud instances using virtio-gpu could be affected by malicious local users or compromised containers.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local access and ability to trigger virtio-gpu operations. Likely requires some level of privilege to interact with GPU driver.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Kernel versions containing the fix commits (259773fc8742, 367882a5a944, 39caef09666c, adbdd21983fa, bd63f11f4c3c)

Vendor Advisory: https://git.kernel.org/stable/c/259773fc874258606c0121767a4a27466ff337eb

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 virtio-gpu if not needed

linux

Remove or disable virtio-gpu driver if GPU acceleration is not required in virtualized environment

modprobe -r virtio_gpu
echo 'blacklist virtio_gpu' >> /etc/modprobe.d/blacklist.conf

🧯 If You Can't Patch

Implement strict access controls to prevent unauthorized users from interacting with GPU devices
Monitor system logs for kernel panic events and virtio-gpu related errors

🔍 How to Verify

Check if Vulnerable:

Check kernel version and verify if virtio-gpu module is loaded: lsmod | grep virtio_gpu

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated to include fix commits, check dmesg for virtio-gpu errors after update

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages
NULL pointer dereference errors in dmesg
virtio_gpu related crash reports

Network Indicators:

None - local vulnerability only

SIEM Query:

source="kernel" AND ("NULL pointer dereference" OR "virtio_gpu" OR "kernel panic")

📊 Metadata

CVE ID: CVE-2022-50181

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: 0.02% exploit probability (3.5th percentile)

Published: June 18, 2025

Last Updated: November 20, 2025

🔗 References

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🔗 Related Vulnerabilities

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