CVE-2022-50454 – This CVE describes a use-after-free vulnerabili... (How to Fix)

Q: What is the severity of CVE-2022-50454?

CVE-2022-50454 has a CVSS score of 7.8 (HIGH). This CVE describes a use-after-free vulnerability in the Linux kernel's nouveau graphics driver. When nouveau_gem_prime_import_sg_table() fails to initialize a buffer object, it incorrectly attempts to reference already-freed memory, potentially leading to kernel crashes or privilege escalation. This affects Linux systems using the open-source NVIDIA nouveau driver.

📋 TL;DR

This CVE describes a use-after-free vulnerability in the Linux kernel's nouveau graphics driver. When nouveau_gem_prime_import_sg_table() fails to initialize a buffer object, it incorrectly attempts to reference already-freed memory, potentially leading to kernel crashes or privilege escalation. This affects Linux systems using the open-source NVIDIA nouveau driver.

💻 Affected Systems

Products:

Linux kernel with nouveau 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: ⚠️ Yes

Notes: Only vulnerable if nouveau driver is loaded and used. Systems with NVIDIA proprietary drivers or no NVIDIA GPUs are not affected.

📦 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

Local privilege escalation to root, kernel panic causing system crash, or arbitrary code execution in kernel context.

🟠

Likely Case

Kernel panic leading to denial of service (system crash) when specific graphics operations fail.

🟢

If Mitigated

No impact if system doesn't use nouveau driver or has patch applied.

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

🏢 Internal Only: MEDIUM - Local users could potentially exploit this for privilege escalation or DoS attacks.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local access and ability to trigger specific graphics operations. Exploit would need to control memory layout and timing.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel with commits 3aeda2fe6517cc52663d4ce3588dd43f0d4124a7 or later

Vendor Advisory: https://git.kernel.org/stable/c/3aeda2fe6517cc52663d4ce3588dd43f0d4124a7

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from your distribution. 2. For RHEL/CentOS: yum update kernel. 3. For Ubuntu/Debian: apt update && apt upgrade linux-image-*. 4. Reboot system to load new kernel.

🔧 Temporary Workarounds

Disable nouveau driver

linux

Blacklist nouveau kernel module to prevent loading

echo 'blacklist nouveau' >> /etc/modprobe.d/blacklist-nouveau.conf
update-initramfs -u
reboot

Use NVIDIA proprietary driver

linux

Replace nouveau with NVIDIA's official proprietary driver

apt-get install nvidia-driver-* # Ubuntu/Debian
yum install kmod-nvidia # RHEL/CentOS

🧯 If You Can't Patch

Restrict local user access to systems with vulnerable kernels
Monitor for kernel panic/crash events and investigate root causes

🔍 How to Verify

Check if Vulnerable:

Check if nouveau module is loaded: lsmod | grep nouveau. Check kernel version: uname -r and compare with distribution's patched versions.

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is updated and nouveau module version matches patched kernel. Check dmesg for nouveau-related errors.

📡 Detection & Monitoring

Log Indicators:

Kernel panic messages in /var/log/messages or journalctl
nouveau driver error messages
System crash/reboot events

Network Indicators:

None - local exploit only

SIEM Query:

EventID=41 OR Source='kernel' AND Message LIKE '%nouveau%' AND (Message LIKE '%panic%' OR Message LIKE '%BUG%' OR Message LIKE '%use-after-free%')

📊 Metadata

CVE ID: CVE-2022-50454

CVSS v3 Score: 7.8 (HIGH)

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

CWE: CWE-416

EPSS Score: 0.02% exploit probability (5.6th percentile)

Published: October 1, 2025

Last Updated: January 16, 2026

🔗 References

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