CVE-2023-53678
📋 TL;DR
This CVE-2023-53678 is a NULL pointer dereference vulnerability in the Linux kernel's Intel i915 graphics driver. It occurs when attempting to suspend a system without display hardware where the framebuffer device (fbdev) was never initialized, causing a kernel panic during system suspend. This affects Linux systems with Intel graphics hardware, particularly those without displays or where fbdev initialization failed.
💻 Affected Systems
- Linux kernel with Intel i915 graphics driver
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service during system suspend operations, potentially causing data loss or system instability.
Likely Case
System suspend failures on headless servers or systems without displays, requiring manual intervention to recover.
If Mitigated
System suspend works normally without crashes when patched or when fbdev is properly initialized.
🎯 Exploit Status
Exploitation requires local access and ability to trigger system suspend. The vulnerability is triggered during normal system operations rather than being actively exploited.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in Linux kernel commit 9542d708409a41449e99c9a464deb5e062c4bee2 and backported to stable branches
Vendor Advisory: https://git.kernel.org/stable/c/27b5871abd5cc068c549fd23062c82e257fc0b9c
Restart Required: No
Instructions:
1. Update Linux kernel to version containing the fix. 2. For distributions: Apply kernel updates from your vendor. 3. Rebuild kernel if using custom builds with the patched source.
🔧 Temporary Workarounds
Disable system suspend
systemd-based LinuxPrevent system suspend operations that trigger the vulnerability
systemctl mask suspend.target
systemctl mask hibernate.target
systemctl mask hybrid-sleep.target
Ensure fbdev initialization
allConfigure system to ensure fbdev is properly initialized if display hardware exists
Check /proc/fb for fbdev status
Ensure proper graphics driver loading
🧯 If You Can't Patch
- Avoid system suspend operations on affected systems
- Use alternative power management methods that don't trigger the vulnerable code path
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if system experiences crashes during suspend with Intel graphics hardware presentCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commit and test system suspend functionality📡 Detection & Monitoring
Log Indicators:
- Kernel NULL pointer dereference errors during suspend
- Oops messages with intel_fbdev_set_suspend in call trace
- System crash logs during PM suspend operations
Network Indicators:
- None - this is a local system vulnerability
SIEM Query:
Search for kernel logs containing 'NULL pointer dereference' AND 'intel_fbdev_set_suspend' OR 'i915_drm_suspend'