CVE-2023-52864

In the Linux kernel, the following vulnerability has been resolved: platform/x86: wmi: Fix opening of char device Since commit fa1f68db6ca7 ("drivers: misc: pass miscdevice pointer via file private data"), the miscdevice stores a pointer to itself inside filp->private_data, which means that private_data will not be NULL when wmi_char_open() is called. This might cause memory corruption should wmi_char_open() be unable to find its driver, something which can happen when the associated WMI device is deleted in wmi_free_devices(). Fix the problem by using the miscdevice pointer to retrieve the WMI device data associated with a char device using container_of(). This also avoids wmi_char_open() picking a wrong WMI device bound to a driver with the same name as the original driver.

• linux linux kernel (>= 4.15 < 4.19.299) • linux linux kernel (>= 4.20 < 5.4.261) • linux linux kernel (>= 5.5 < 5.10.201) • linux linux kernel (>= 5.11 < 5.15.139) • linux linux kernel (>= 5.16 < 6.1.63) • linux linux kernel (>= 6.2 < 6.5.12) • linux linux kernel (>= 6.6 < 6.6.2)