linux-cve-announce - CVE-2026-23158: gpio: virtuser: fix UAF in configfs release path

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Message-ID: <2026021417-CVE-2026-23158-052d@gregkh>
Date: Sat, 14 Feb 2026 17:04:24 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23158: gpio: virtuser: fix UAF in configfs release path

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

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

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

gpio: virtuser: fix UAF in configfs release path

The gpio-virtuser configfs release path uses guard(mutex) to protect
the device structure. However, the device is freed before the guard
cleanup runs, causing mutex_unlock() to operate on freed memory.

Specifically, gpio_virtuser_device_config_group_release() destroys
the mutex and frees the device while still inside the guard(mutex)
scope. When the function returns, the guard cleanup invokes
mutex_unlock(&dev->lock), resulting in a slab use-after-free.

Limit the mutex lifetime by using a scoped_guard() only around the
activation check, so that the lock is released before mutex_destroy()
and kfree() are called.

The Linux kernel CVE team has assigned CVE-2026-23158 to this issue.


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

	Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.12.69 with commit 815a8e3bf72811d402b30bd4a53cde5e9df7a563
	Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.18.9 with commit 7bec90f605cfb138006f5ba575f2310593347110
	Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.19 with commit 53ad4a948a4586359b841d607c08fb16c5503230

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-2026-23158
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-virtuser.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/815a8e3bf72811d402b30bd4a53cde5e9df7a563
	https://git.kernel.org/stable/c/7bec90f605cfb138006f5ba575f2310593347110
	https://git.kernel.org/stable/c/53ad4a948a4586359b841d607c08fb16c5503230