CVE-2023-52864: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 4.15, before 4.19.299 (fixed in 4.19.299); from 4.20, before 5.4.261 (fixed in 5.4.261); from 5.5, before 5.10.201 (fixed in 5.10.201); from 5.11, before 5.15.139 (fixed in 5.15.139); from 5.16, before 6.1.63 (fixed in 6.1.63); from 6.2, before 6.5.12 (fixed in 6.5.12); …

Published 2024-05-21. Last modified 2026-08-04.