CVE-2026-23475

Analyzed Analyzed - Analysis Complete

NULL Pointer Dereference in Linux Kernel SPI Controller Statistics

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 statistics allocation The controller per-cpu statistics is not allocated until after the controller has been registered with driver core, which leaves a window where accessing the sysfs attributes can trigger a NULL-pointer dereference. Fix this by moving the statistics allocation to controller allocation while tying its lifetime to that of the controller (rather than using implicit devres).

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-03

Last Modified

2026-05-20

Generated

2026-07-06

AI Q&A

2026-04-04

EPSS Evaluated

2026-07-04

NVD

CVE-2026-23475

EUVD

EUVD-2026-18750

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-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Mitigation Strategies

The vulnerability has been fixed by updating the Linux kernel to a version where the spi controller per-cpu statistics allocation occurs during controller allocation, preventing NULL-pointer dereference.

Therefore, the immediate step to mitigate this vulnerability is to update your Linux kernel to the fixed version released on or after 2026-04-03.

Executive Summary

This vulnerability exists in the Linux kernel's SPI controller statistics allocation process. The per-CPU statistics for the controller are not allocated until after the controller has been registered with the driver core. This timing creates a window during which accessing the sysfs attributes can cause a NULL-pointer dereference, potentially leading to system instability or crashes.

The fix involves moving the statistics allocation to the time of controller allocation and tying its lifetime directly to the controller, rather than relying on implicit device resource management.

Impact Analysis

This vulnerability can lead to a NULL-pointer dereference when sysfs attributes are accessed during the vulnerable window. This can cause system crashes or instability, potentially affecting the reliability and availability of systems running the affected Linux kernel.

Hi! I’m here to help you understand CVE-2026-23475. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70