En-Wei Wu

**Name of the Vulnerable Software and Affected Versions** Linux kernel (affected versions not specified) **Description** The issue arises from a race condition in the ACPI notify handler, specifically in the `intel-vbtn` module, which can lead to a kernel NULL pointer dereference. This occurs when the handler attempts to register `priv->switches dev` twice, resulting in a duplicate filename error in `sysfs` and a subsequent kernel crash. The problem is triggered on Dell Venue 7140 tablets when undocking from the keyboard. To fix this, a mutex is used to protect the `intel-vbtn` notify handler from racing with itself. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.