CVE-2023-52783
📋 TL;DR
A null pointer dereference vulnerability in the Linux kernel's wangxun network driver causes kernel panic when devices use custom subsystem vendor IDs. This affects Linux systems using the affected wangxun driver, potentially causing system crashes and denial of service.
💻 Affected Systems
- Linux kernel with wangxun network 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 →⚠️ Risk & Real-World Impact
Worst Case
Complete system crash (kernel panic) leading to denial of service, requiring physical or remote console access to reboot the system.
Likely Case
System crash when specific network hardware with custom subsystem vendor IDs is detected, causing temporary service disruption until system reboot.
If Mitigated
No impact if patched or if affected driver not loaded; limited to systems with specific hardware configurations.
🎯 Exploit Status
Requires specific hardware configuration and driver loading; not a remote code execution vulnerability
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commits 61a55071653974dab172d4c5d699bb365cfd13c9 and 8ba2c459668cfe2aaacc5ebcd35b4b9ef8643013
Vendor Advisory: https://git.kernel.org/stable/c/61a55071653974dab172d4c5d699bb365cfd13c9
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from distribution vendor. 2. Rebuild kernel if compiling from source with patches. 3. Reboot system to load new kernel.
🔧 Temporary Workarounds
Disable wangxun driver
linuxPrevent loading of vulnerable driver module
echo 'blacklist wangxun' >> /etc/modprobe.d/blacklist.conf
rmmod wangxun
Avoid custom subsystem vendor IDs
allEnsure network hardware uses standard vendor IDs
🧯 If You Can't Patch
- Monitor systems for kernel panic events and maintain current backups
- Consider replacing network hardware that triggers the vulnerability
🔍 How to Verify
Check if Vulnerable:
Check if wangxun driver is loaded: lsmod | grep wangxunCheck Version:
uname -rVerify Fix Applied:
Check kernel version includes fix commits or verify wangxun driver version📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages in /var/log/messages or dmesg
- System crash/reboot events
Network Indicators:
- Sudden loss of network connectivity on affected interface
SIEM Query:
event_type:kernel_panic AND driver:wangxun OR event_type:system_reboot AND previous_uptime<5min