linux-cve-announce - CVE-2025-38027: regulator: max20086: fix invalid memory access

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Message-ID: <2025061848-CVE-2025-38027-3bca@gregkh>
Date: Wed, 18 Jun 2025 11:29:01 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38027: regulator: max20086: fix invalid memory access

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

regulator: max20086: fix invalid memory access

max20086_parse_regulators_dt() calls of_regulator_match() using an
array of struct of_regulator_match allocated on the stack for the
matches argument.

of_regulator_match() calls devm_of_regulator_put_matches(), which calls
devres_alloc() to allocate a struct devm_of_regulator_matches which will
be de-allocated using devm_of_regulator_put_matches().

struct devm_of_regulator_matches is populated with the stack allocated
matches array.

If the device fails to probe, devm_of_regulator_put_matches() will be
called and will try to call of_node_put() on that stack pointer,
generating the following dmesg entries:

max20086 6-0028: Failed to read DEVICE_ID reg: -121
kobject: '\xc0$\xa5\x03' (000000002cebcb7a): is not initialized, yet
kobject_put() is being called.

Followed by a stack trace matching the call flow described above.

Switch to allocating the matches array using devm_kcalloc() to
avoid accessing the stack pointer long after it's out of scope.

This also has the advantage of allowing multiple max20086 to probe
without overriding the data stored inside the global of_regulator_match.

The Linux kernel CVE team has assigned CVE-2025-38027 to this issue.

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

	Issue introduced in 5.17 with commit bfff546aae50ae68ed395bf0e0848188d27b0ba3 and fixed in 6.1.140 with commit 6ba30f7aa2c550b2ac04f16b81a19a8c045b8660
	Issue introduced in 5.17 with commit bfff546aae50ae68ed395bf0e0848188d27b0ba3 and fixed in 6.6.92 with commit 7bddac8603d4e396872c2fbf4403ec08e7b1d7c8
	Issue introduced in 5.17 with commit bfff546aae50ae68ed395bf0e0848188d27b0ba3 and fixed in 6.12.30 with commit d2a9a92bb4cc7568cff68241b0051dc7268bdc68
	Issue introduced in 5.17 with commit bfff546aae50ae68ed395bf0e0848188d27b0ba3 and fixed in 6.14.8 with commit 5578ab04bd7732f470fc614bbc0a924900399fb8
	Issue introduced in 5.17 with commit bfff546aae50ae68ed395bf0e0848188d27b0ba3 and fixed in 6.15 with commit 6b0cd72757c69bc2d45da42b41023e288d02e772

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-2025-38027
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/regulator/max20086-regulator.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/6ba30f7aa2c550b2ac04f16b81a19a8c045b8660
	https://git.kernel.org/stable/c/7bddac8603d4e396872c2fbf4403ec08e7b1d7c8
	https://git.kernel.org/stable/c/d2a9a92bb4cc7568cff68241b0051dc7268bdc68
	https://git.kernel.org/stable/c/5578ab04bd7732f470fc614bbc0a924900399fb8
	https://git.kernel.org/stable/c/6b0cd72757c69bc2d45da42b41023e288d02e772