CVE-2026-80968: ALSA: mts64: Check card index validity at probe

CVE-2026-80968: ALSA: mts64: Check card index validity at probe

[Greg Kroah-Hartman]

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

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

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

ALSA: mts64: Check card index validity at probe

Although mts64 driver has a check of the given devptr->id value, it
doesn't check for a negative id, which is often given as "none" or
such value when bound via sysfs.  This may lead to OOB access for
index[] and other parameters.

Add a sanity check for the card index and warn/correct it if it's a
value out of the range.

The Linux kernel CVE team has assigned CVE-2026-80968 to this issue.


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

	Fixed in 6.12.109 with commit 036e7aa793375ab16ea0f64b8de6673220416cc1
	Fixed in 6.18.50 with commit a4e774eeb61aec64da5b03d3becffde26f7fe4de
	Fixed in 7.2.4 with commit cf3af453a48c8d905512dfc44a5a59439b70f4f0
	Fixed in 7.3-rc1 with commit d18a260720f86a5f8b5fcfefc4ba2e9dd01c10f8

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-2026-80968
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/drivers/mts64.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/036e7aa793375ab16ea0f64b8de6673220416cc1
	https://git.kernel.org/stable/c/a4e774eeb61aec64da5b03d3becffde26f7fe4de
	https://git.kernel.org/stable/c/cf3af453a48c8d905512dfc44a5a59439b70f4f0
	https://git.kernel.org/stable/c/d18a260720f86a5f8b5fcfefc4ba2e9dd01c10f8