Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2021-47652
CVE-2021-47652:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2021-47652 is a vulnerability in the Linux kernel's SMSC UFX6000/7000 USB display adapter driver (smscufx). The issue was discovered and reported by Hulk Robot, and was publicly disclosed in February 2025. The vulnerability affects the fbdev subsystem in the Linux kernel, specifically in the ufxusbprobe() function of the smscufx driver (NVD).
Technical details
The vulnerability is a NULL pointer dereference bug that occurs in the ufxusbprobe() function. When fballoccmap() fails, fbdestroymodelist() is called to destroy the modelist in the error handling path. However, since the modelist has not been initialized at this point, it results in a null pointer dereference at address 0x0000000000000000. The issue was traced to incorrect initialization order of the modelist structure (Kernel Commit).
Impact
The vulnerability can lead to a kernel NULL pointer dereference, which typically results in a kernel panic or system crash when the affected driver is loaded and encounters the error condition (NVD).
Mitigation and workarounds
The vulnerability has been fixed by initializing the modelist before calling fballoccmap() in the ufxusbprobe() function. The fix involves moving the INITLISTHEAD(&info->modelist) call before the fballoccmap() call to ensure proper initialization order (Kernel Commit).
Additional resources
Source: This report was generated using AI
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