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Vulnerability DatabaseCVE-2022-49954
CVE-2022-49954:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49954 is a vulnerability discovered in the Linux kernel affecting the iforce input driver. The issue was identified when syzbot reported a hung task at _inputunregister_device(). The vulnerability was disclosed on June 18, 2025, and affects Linux kernel systems utilizing the iforce driver (NVD CVE).
Technical details
The vulnerability stems from a synchronization issue in the iforce driver where iforceclose() waits at waiteventinterruptible() with dev->mutex held, which blocks inputdisconnectdevice() from _inputunregisterdevice(). The root cause was traced to commit c2b27ef672992a20 ('Input: iforce - wait for command completion when closing the device') which failed to implement a wakeup() call after clearbit() operation (NVD CVE, Wiz).
Impact
The vulnerability can result in a system hang condition when attempting to unregister an iforce input device, as the mutex lock prevents proper device disconnection (Wiz).
Mitigation and workarounds
The issue has been resolved in the Linux kernel through a patch that implements proper synchronization by introducing a helper that calls clearbit() followed by wakeup_all() to ensure proper thread wakeup (NVD CVE).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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