Bug 2454842 (CVE-2026-23475)

Summary: CVE-2026-23475 kernel: spi: fix statistics allocation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's Serial Peripheral Interface (SPI) component. The system's per-CPU statistics for the SPI controller were not allocated until after the controller was registered. This created a window where a local user or process could access system files (sysfs attributes) related to the SPI controller, leading to a NULL-pointer dereference. This vulnerability can cause a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-04-03 16:03:45 UTC 
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).
Comment 1 Jon Moroney 2026-04-03 18:03:21 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040323-CVE-2026-23475-8bf5@gregkh/T