Bug 2405134 (CVE-2025-40005)

Summary:	CVE-2025-40005 kernel: spi: cadence-quadspi: Implement refcount to handle unbind during busy
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel’s cadence-quadspi SPI controller driver. The driver did not implement reference counting when devices are bound/unbound, assuming that forced removals (“unbind”) will not happen while indirect read or write operations are ongoing. However, a root user can force device removal even during busy operations, and this can lead to a kernel crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-10-20 17:23:56 UTC

In the Linux kernel, the following vulnerability has been resolved:

spi: cadence-quadspi: Implement refcount to handle unbind during busy

driver support indirect read and indirect write operation with
assumption no force device removal(unbind) operation. However
force device removal(removal) is still available to root superuser.

Unbinding driver during operation causes kernel crash. This changes
ensure driver able to handle such operation for indirect read and
indirect write by implementing refcount to track attached devices
to the controller and gracefully wait and until attached devices
remove operation completed before proceed with removal operation.

Comment 1 Jon Moroney 2025-10-20 17:40:19 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102000-CVE-2025-40005-b351@gregkh/T