CVE-2021-47195 - CVE House
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Status published Medium CVE-2021-47195

spi: fix use-after-free of the add_lock mutex

Vulnerability 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().

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
aa3f3d7bef59583f2d3234173105a27ff61ef8fe, c8dce228db6f81dbc897a018dfc5c418e917cf64, 6098475d4cb48d821bdf453c61118c56e26294f0, 722ef19a161ce3fffb3d1b01ce2301c306639bdd, 5.14.15, 5.15, 0, 5.15.5, 5.16

Timeline

Official Publish: April 10th, 2024
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.