linux-cve-announce - CVE-2025-21661: gpio: virtuser: fix missing lookup table cleanups

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Message-ID: <2025012134-CVE-2025-21661-2a1e@gregkh>
Date: Tue, 21 Jan 2025 13:18:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21661: gpio: virtuser: fix missing lookup table cleanups

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

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

gpio: virtuser: fix missing lookup table cleanups

When a virtuser device is created via configfs and the probe fails due
to an incorrect lookup table, the table is not removed. This prevents
subsequent probe attempts from succeeding, even if the issue is
corrected, unless the device is released. Additionally, cleanup is also
needed in the less likely case of platform_device_register_full()
failure.

Besides, a consistent memory leak in lookup_table->dev_id was spotted
using kmemleak by toggling the live state between 0 and 1 with a correct
lookup table.

Introduce gpio_virtuser_remove_lookup_table() as the counterpart to the
existing gpio_virtuser_make_lookup_table() and call it from all
necessary points to ensure proper cleanup.

The Linux kernel CVE team has assigned CVE-2025-21661 to this issue.

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

	Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.12.10 with commit d72d0126b1f6981f6ce8b4247305f359958c11b5
	Issue introduced in 6.11 with commit 91581c4b3f29e2e22aeb1a62e842d529ca638b2d and fixed in 6.13 with commit a619cba8c69c434258ff4101d463322cd63e1bdc

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-2025-21661
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/d72d0126b1f6981f6ce8b4247305f359958c11b5
	https://git.kernel.org/stable/c/a619cba8c69c434258ff4101d463322cd63e1bdc