CVEvulnerability
CVE-2021-47195
5.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2024-04-10
- Last modified
- 2026-06-17
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-416
Description
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().
Affected configurations
• linux linux kernel (> 5.15.0 < 5.15.5)
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4 git.kernel.org
- https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d Patch
- https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd git.kernel.org
- https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434 Patch
- https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d Patch
- https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434 Patch