CVE-2026-72062: gpio: mt7621: avoid corruption of shared interrupt trigger state

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

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

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

gpio: mt7621: avoid corruption of shared interrupt trigger state

The bank-shared fields like 'rising' and 'falling' are modified using
non-atomic read-modify-write operations. Since every gpio chip instance
represents an entire bank of 32 pins, if 'mediatek_gpio_irq_type()' is
called concurrently for different IRQs on the same bank a possible overwrite
of each other's configuration is possible. Thus, protect this state with
'gpio_generic_lock_irqsave' lock in the same way it is handled in irp_chip
'mediatek_gpio_irq_mask()' and 'mediatek_gpio_irq_unmask()' callbacks.

The Linux kernel CVE team has assigned CVE-2026-72062 to this issue.


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

	Issue introduced in 4.19 with commit 4ba9c3afda41213ec98c30053e32963892e6dc7c and fixed in 6.6.148 with commit 207d3ebf36f654a43a934addeb4d6775cb2dd667
	Issue introduced in 4.19 with commit 4ba9c3afda41213ec98c30053e32963892e6dc7c and fixed in 6.12.101 with commit 877a243006788aaa586b2d087f27c9f3628071b0
	Issue introduced in 4.19 with commit 4ba9c3afda41213ec98c30053e32963892e6dc7c and fixed in 6.18.40 with commit d3b9026ef78da3018a7d2c5a9c9d611de6d45c47
	Issue introduced in 4.19 with commit 4ba9c3afda41213ec98c30053e32963892e6dc7c and fixed in 7.1.5 with commit a60a40c9ba30edd06d3fb4215fdf430ed968728e
	Issue introduced in 4.19 with commit 4ba9c3afda41213ec98c30053e32963892e6dc7c and fixed in 7.2-rc2 with commit 1781172526d1092323af443fa03f00e6de560401

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-2026-72062
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/gpio/gpio-mt7621.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/207d3ebf36f654a43a934addeb4d6775cb2dd667
	https://git.kernel.org/stable/c/877a243006788aaa586b2d087f27c9f3628071b0
	https://git.kernel.org/stable/c/d3b9026ef78da3018a7d2c5a9c9d611de6d45c47
	https://git.kernel.org/stable/c/a60a40c9ba30edd06d3fb4215fdf430ed968728e
	https://git.kernel.org/stable/c/1781172526d1092323af443fa03f00e6de560401