linux-cve-announce - CVE-2025-37968: iio: light: opt3001: fix deadlock due to concurrent flag access

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Message-ID: <2025052045-CVE-2025-37968-5eb1@gregkh>
Date: Tue, 20 May 2025 18:45:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37968: iio: light: opt3001: fix deadlock due to concurrent flag access

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

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

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

iio: light: opt3001: fix deadlock due to concurrent flag access

The threaded IRQ function in this driver is reading the flag twice: once to
lock a mutex and once to unlock it. Even though the code setting the flag
is designed to prevent it, there are subtle cases where the flag could be
true at the mutex_lock stage and false at the mutex_unlock stage. This
results in the mutex not being unlocked, resulting in a deadlock.

Fix it by making the opt3001_irq() code generally more robust, reading the
flag into a variable and using the variable value at both stages.

The Linux kernel CVE team has assigned CVE-2025-37968 to this issue.


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

	Issue introduced in 4.3 with commit 94a9b7b1809f56cfaa080e70ec49b6979563a237 and fixed in 6.14.7 with commit 2c95c8f0959d0a72575eabf2ff888f47ed6d8b77
	Issue introduced in 4.3 with commit 94a9b7b1809f56cfaa080e70ec49b6979563a237 and fixed in 6.15-rc6 with commit f063a28002e3350088b4577c5640882bf4ea17ea

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-2025-37968
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/iio/light/opt3001.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/2c95c8f0959d0a72575eabf2ff888f47ed6d8b77
	https://git.kernel.org/stable/c/f063a28002e3350088b4577c5640882bf4ea17ea