CVE-2023-53263 – This is a use-after-free vulnerability in the L... (How to Fix)

Q: What is the severity of CVE-2023-53263?

CVE-2023-53263 has a CVSS score of 7.8 (HIGH). This is a use-after-free vulnerability in the Linux kernel's Nouveau display driver that occurs during error handling when creating connectors. If exploited, it could lead to memory corruption, kernel crashes, or potential privilege escalation. Systems using affected Linux kernel versions with Nouveau driver enabled are vulnerable.

📋 TL;DR

This is a use-after-free vulnerability in the Linux kernel's Nouveau display driver that occurs during error handling when creating connectors. If exploited, it could lead to memory corruption, kernel crashes, or potential privilege escalation. Systems using affected Linux kernel versions with Nouveau driver enabled are vulnerable.

💻 Affected Systems

Products:

Linux kernel with Nouveau display driver

Versions: Linux kernel versions containing commit 2b5d1c29f6c4 up to patches in stable releases

Operating Systems: Linux distributions using affected kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only vulnerable when Nouveau driver is loaded and used (typically with NVIDIA graphics hardware)

📦 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

Kernel panic leading to system crash or potential privilege escalation to root via memory corruption.

🟠

Likely Case

System instability, kernel crashes, or denial of service when Nouveau driver encounters specific error conditions.

🟢

If Mitigated

System remains stable with Nouveau driver disabled or patched kernel.

🌐 Internet-Facing: LOW - Requires local access or ability to trigger Nouveau driver errors.

🏢 Internal Only: MEDIUM - Local users or processes could potentially trigger the vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Requires triggering specific error conditions in Nouveau driver during connector creation

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Linux kernel stable releases containing commits 1b254b791d7b7dea6e8adc887fbbd51746d8bb27, 3f27451c9f29d5ed00232968680c7838a44dcac7, or 872feeecd08c81d212a52211d212897b8a857544

Vendor Advisory: https://git.kernel.org/stable/c/1b254b791d7b7dea6e8adc887fbbd51746d8bb27

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from distribution vendor. 2. Reboot system to load new kernel.

🔧 Temporary Workarounds

Disable Nouveau driver

linux

Prevent loading of vulnerable Nouveau display driver

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

🧯 If You Can't Patch

Disable Nouveau driver via kernel boot parameters (nouveau.modeset=0)
Use proprietary NVIDIA driver instead of Nouveau

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if Nouveau driver is loaded: lsmod | grep nouveau

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is patched and Nouveau driver loads without issues

📡 Detection & Monitoring

Log Indicators:

Kernel oops messages
System crashes related to drm/nouveau
Use-after-free warnings in kernel logs

Network Indicators:

None - local vulnerability

SIEM Query:

source="kernel" AND ("nouveau" OR "drm") AND ("Oops" OR "panic" OR "use-after-free")

📊 Metadata

CVE ID: CVE-2023-53263

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: 0.01% exploit probability (1.7th percentile)

Published: September 16, 2025

Last Updated: January 14, 2026

🔗 References

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🔗 Related Vulnerabilities

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