CVE-2026-74415: spi: atcspi200: fix use-after-free when driver unbind

From: Greg Kroah-Hartman <[email protected]>

Description
===========

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

spi: atcspi200: fix use-after-free when driver unbind

DMA resource is initialized after SPI controller registration. So
when driver unbind, this can trigger a use-after-free when DMA is
torn down while the controller is still alive and triggers DMA transfers.

The Linux kernel CVE team has assigned CVE-2026-74415 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 7.0 with commit 34e3815ea4597131d4324a4aa243d2201e672005 and fixed in 7.1.5 with commit af6a34c41683067a314d2b58b39edecb2e5e4ac6
	Issue introduced in 7.0 with commit 34e3815ea4597131d4324a4aa243d2201e672005 and fixed in 7.2-rc1 with commit 565bdf45125a05aa8f622f58f598283f46ba43f4

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-74415
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/spi/spi-atcspi200.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/af6a34c41683067a314d2b58b39edecb2e5e4ac6
	https://git.kernel.org/stable/c/565bdf45125a05aa8f622f58f598283f46ba43f4