CVE-2026-31389

Analyzed Analyzed - Analysis Complete

Use-After-Free in Linux Kernel SPI Controller Registration

Publication date: 2026-04-03

Last updated on: 2026-05-20

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: spi: fix use-after-free on controller registration failure Make sure to deregister from driver core also in the unlikely event that per-cpu statistics allocation fails during controller registration to avoid use-after-free (of driver resources) and unclocked register accesses.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-03

Last Modified

2026-05-20

Generated

2026-07-06

AI Q&A

2026-04-03

EPSS Evaluated

2026-07-05

NVD

CVE-2026-31389

EUVD

EUVD-2026-18761

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 6.2 (inc) to 6.6.130 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.78 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.20 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.10 (exc)
linux	linux_kernel	From 6.0 (inc) to 6.1.167 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Impact Analysis

The use-after-free vulnerability can cause the system to access freed memory, which may lead to system instability, crashes, or potential execution of arbitrary code.

Such issues can compromise the reliability and security of the Linux kernel, potentially affecting any system using the vulnerable SPI controller registration code.

Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel related to the SPI (Serial Peripheral Interface) controller registration process.

Specifically, if the allocation of per-CPU statistics fails during the controller registration, the driver does not properly deregister from the driver core. This leads to use-after-free of driver resources and unclocked register accesses.

Mitigation Strategies

The vulnerability has been resolved by fixing the use-after-free issue in the Linux kernel related to SPI controller registration failure.

To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

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