CVE-2026-64484: ALSA: es1938: check snd_ctl_new1() return value

From: Greg Kroah-Hartman <[email protected]>

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

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

ALSA: es1938: check snd_ctl_new1() return value

snd_ctl_new1() can return NULL when memory allocation fails.
snd_es1938_mixer() does not check the return value before dereferencing
the pointer, which can lead to a NULL pointer dereference.

Add a NULL check after snd_ctl_new1() and return -ENOMEM if it fails.

The Linux kernel CVE team has assigned CVE-2026-64484 to this issue.


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

	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.261 with commit 96cad5bd7d0a176db3fdc06717a41271247336bd
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.212 with commit 6c4efebaf73e217efbd08cdbda805758a7db3680
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.178 with commit 41759affbcfe3d51a32900da9547a1ffd744a85f
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.145 with commit 7531a37720c2545a480fd0fa464978569bf9d6a2
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.96 with commit af01c48e17a66fa038af210a5c49d6cdefd210bd
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.18.39 with commit 9e53e99b6fa3cd82992d963cbff58dbbd1df8651
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.1.4 with commit 1949163dee39e0e4a1468f37dd7302962f6af45a
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.2-rc1 with commit 1edd1f02dddd20aeb6066ded41017615766ea42f

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-2026-64484
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/es1938.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/96cad5bd7d0a176db3fdc06717a41271247336bd
	https://git.kernel.org/stable/c/6c4efebaf73e217efbd08cdbda805758a7db3680
	https://git.kernel.org/stable/c/41759affbcfe3d51a32900da9547a1ffd744a85f
	https://git.kernel.org/stable/c/7531a37720c2545a480fd0fa464978569bf9d6a2
	https://git.kernel.org/stable/c/af01c48e17a66fa038af210a5c49d6cdefd210bd
	https://git.kernel.org/stable/c/9e53e99b6fa3cd82992d963cbff58dbbd1df8651
	https://git.kernel.org/stable/c/1949163dee39e0e4a1468f37dd7302962f6af45a
	https://git.kernel.org/stable/c/1edd1f02dddd20aeb6066ded41017615766ea42f