Vulnerabilities > CVE-2021-47195 - Use After Free vulnerability in Linux Kernel
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
In the Linux kernel, the following vulnerability has been resolved: spi: fix use-after-free of the add_lock mutex Commit 6098475d4cb4 ("spi: Fix deadlock when adding SPI controllers on SPI buses") introduced a per-controller mutex. But mutex_unlock() of said lock is called after the controller is already freed: spi_unregister_controller(ctlr) -> put_device(&ctlr->dev) -> spi_controller_release(dev) -> mutex_unlock(&ctrl->add_lock) Move the put_device() after the mutex_unlock().
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 6 |
Common Weakness Enumeration (CWE)
References
- https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4
- https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d
- https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d
- https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd
- https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434
- https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434