CVE-2021-47195
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.
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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().
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 12th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4
- https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2dPatch
- https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd
- https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434Patch
- https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2dPatch
- https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.