CVE-2026-74333: ASoC: amd: acp-sdw-legacy: Bound DAI link iteration

CVE-2026-74333: ASoC: amd: acp-sdw-legacy: Bound DAI link iteration

[Greg Kroah-Hartman]

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

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

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

ASoC: amd: acp-sdw-legacy: Bound DAI link iteration

create_sdw_dailinks() walks soc_dais until it finds an entry with
initialised cleared, but soc_dais is allocated with exactly num_ends
entries. If all entries are initialised, the loop reads past the end of
the array.

This was reported by KASAN:

  BUG: KASAN: slab-out-of-bounds in mc_probe+0x26b3/0x2774 [snd_acp_sdw_legacy_mach]
  Read of size 1

Pass the allocated entry count to create_sdw_dailinks() and stop before
reading past the array.

The Linux kernel CVE team has assigned CVE-2026-74333 to this issue.


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

	Issue introduced in 6.13 with commit 2981d9b0789c44b7375e7d599caf71bd843afc9e and fixed in 6.18.40 with commit 1279bdab5fa1f28c168e54215db506e87c6fac1e
	Issue introduced in 6.13 with commit 2981d9b0789c44b7375e7d599caf71bd843afc9e and fixed in 7.1.5 with commit 0230471eef5902207516851dcd47c559571dded2
	Issue introduced in 6.13 with commit 2981d9b0789c44b7375e7d599caf71bd843afc9e and fixed in 7.2-rc1 with commit d49ecdf327cc91062d2f80996a163cf65fda1e60

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-2026-74333
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/soc/amd/acp/acp-sdw-legacy-mach.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/1279bdab5fa1f28c168e54215db506e87c6fac1e
	https://git.kernel.org/stable/c/0230471eef5902207516851dcd47c559571dded2
	https://git.kernel.org/stable/c/d49ecdf327cc91062d2f80996a163cf65fda1e60