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CVE-2023-52864 is a flaw in the Linux kernel platform/x86 WMI character-device open path. Following a miscdevice framework change that places the miscdevice pointer in the file private-data field, wmi_char_open() could incorrectly treat the field as WMI-specific state. If the associated WMI device had been removed during wmi_free_devices() and the open routine could not locate its driver, this invalid state could result in memory corruption. The same logic could also associate the character device with an incorrect WMI device where multiple devices were bound to drivers having the same name. The fix derives the owning WMI device from the miscdevice pointer using container_of(), ensuring that the character device is associated with its correct device data.
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Linux kernel platform/x86 WMI character-device opening flaw.
Linux kernel platform/x86 WMI character-device opening flaw.
Flaw in Linux x86 WMI character-device opening logic.
Linux kernel x86 WMI subsystem flaw related to opening its character device.
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