linux-cve-announce - CVE-2026-23076: ALSA: ctxfi: Fix potential OOB access in audio mixer handling

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Message-ID: <2026020420-CVE-2026-23076-b054@gregkh>
Date: Wed,  4 Feb 2026 17:14:35 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23076: ALSA: ctxfi: Fix potential OOB access in audio mixer handling

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

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

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

ALSA: ctxfi: Fix potential OOB access in audio mixer handling

In the audio mixer handling code of ctxfi driver, the conf field is
used as a kind of loop index, and it's referred in the index callbacks
(amixer_index() and sum_index()).

As spotted recently by fuzzers, the current code causes OOB access at
those functions.
| UBSAN: array-index-out-of-bounds in /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c:347:48
| index 8 is out of range for type 'unsigned char [8]'

After the analysis, the cause was found to be the lack of the proper
(re-)initialization of conj field.

This patch addresses those OOB accesses by adding the proper
initializations of the loop indices.

The Linux kernel CVE team has assigned CVE-2026-23076 to this issue.

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

	Fixed in 6.6.122 with commit a8c42d11b0526a89192bd2f79facb4c60c8a1f38
	Fixed in 6.12.68 with commit d77ba72558cd66704f0fb7e0969f697e87c0f71c
	Fixed in 6.18.8 with commit 873e2360d247eeee642878fcc3398babff7e387c
	Fixed in 6.19-rc7 with commit 61006c540cbdedea83b05577dc7fb7fa18fe1276

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-2026-23076
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:
	sound/pci/ctxfi/ctamixer.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/a8c42d11b0526a89192bd2f79facb4c60c8a1f38
	https://git.kernel.org/stable/c/d77ba72558cd66704f0fb7e0969f697e87c0f71c
	https://git.kernel.org/stable/c/873e2360d247eeee642878fcc3398babff7e387c
	https://git.kernel.org/stable/c/61006c540cbdedea83b05577dc7fb7fa18fe1276