linux-cve-announce - CVE-2023-53640: ASoC: lpass: Fix for KASAN use_after

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Message-ID: <2025100715-CVE-2023-53640-3db3@gregkh>
Date: Tue,  7 Oct 2025 17:19:45 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53640: ASoC: lpass: Fix for KASAN use_after_free out of bounds

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

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

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

ASoC: lpass: Fix for KASAN use_after_free out of bounds

When we run syzkaller we get below Out of Bounds error.

"KASAN: slab-out-of-bounds Read in regcache_flat_read"

Below is the backtrace of the issue:

BUG: KASAN: slab-out-of-bounds in regcache_flat_read+0x10c/0x110
Read of size 4 at addr ffffff8088fbf714 by task syz-executor.4/14144
CPU: 6 PID: 14144 Comm: syz-executor.4 Tainted: G        W
Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT)
Call trace:
dump_backtrace+0x0/0x4ec
show_stack+0x34/0x50
dump_stack_lvl+0xdc/0x11c
print_address_description+0x30/0x2d8
kasan_report+0x178/0x1e4
__asan_report_load4_noabort+0x44/0x50
regcache_flat_read+0x10c/0x110
regcache_read+0xf8/0x5a0
_regmap_read+0x45c/0x86c
_regmap_update_bits+0x128/0x290
regmap_update_bits_base+0xc0/0x15c
snd_soc_component_update_bits+0xa8/0x22c
snd_soc_component_write_field+0x68/0xd4
tx_macro_put_dec_enum+0x1d0/0x268
snd_ctl_elem_write+0x288/0x474

By Error checking and checking valid values issue gets rectifies.

The Linux kernel CVE team has assigned CVE-2023-53640 to this issue.

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

	Fixed in 5.15.114 with commit 8f1512d78b5de928f4616a871e77b58fd546e651
	Fixed in 6.1.31 with commit 8d81d3b0ed3610d24191d24f8e9e20f6775f0cc5
	Fixed in 6.3.5 with commit f5e61e3fe799ba2fda4320af23d26d28c3302045
	Fixed in 6.4 with commit 75e5fab7db0cecb6e16b22c34608f0b40a4c7cd1

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-2023-53640
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/codecs/lpass-tx-macro.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/8f1512d78b5de928f4616a871e77b58fd546e651
	https://git.kernel.org/stable/c/8d81d3b0ed3610d24191d24f8e9e20f6775f0cc5
	https://git.kernel.org/stable/c/f5e61e3fe799ba2fda4320af23d26d28c3302045
	https://git.kernel.org/stable/c/75e5fab7db0cecb6e16b22c34608f0b40a4c7cd1