linux-cve-announce - CVE-2023-54066: media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861_i2c_master

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Message-ID: <2025122430-CVE-2023-54066-8ff7@gregkh>
Date: Wed, 24 Dec 2025 13:26:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54066: media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861_i2c_master_xfer

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

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

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

media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861_i2c_master_xfer

In gl861_i2c_master_xfer, msg is controlled by user. When msg[i].buf
is null and msg[i].len is zero, former checks on msg[i].buf would be
passed. Malicious data finally reach gl861_i2c_master_xfer. If accessing
msg[i].buf[0] without sanity check, null ptr deref would happen.
We add check on msg[i].len to prevent crash.

Similar commit:
commit 0ed554fd769a
("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")

The Linux kernel CVE team has assigned CVE-2023-54066 to this issue.


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

	Fixed in 5.10.197 with commit 578b67614ae0e4fba3945b66a4c8f9ae77115bcb
	Fixed in 5.15.133 with commit 2a33fc57133d6f39d62285df6706aeb1714967f1
	Fixed in 6.1.55 with commit dfcd3c010209927b9f45b860f046635dc32e32e1
	Fixed in 6.5.5 with commit 72af676551efe820e309a6c7681c2c4372f37376
	Fixed in 6.6 with commit b97719a66970601cd3151a3e2020f4454a1c4ff6

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-2023-54066
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:
	drivers/media/usb/dvb-usb-v2/gl861.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/578b67614ae0e4fba3945b66a4c8f9ae77115bcb
	https://git.kernel.org/stable/c/2a33fc57133d6f39d62285df6706aeb1714967f1
	https://git.kernel.org/stable/c/dfcd3c010209927b9f45b860f046635dc32e32e1
	https://git.kernel.org/stable/c/72af676551efe820e309a6c7681c2c4372f37376
	https://git.kernel.org/stable/c/b97719a66970601cd3151a3e2020f4454a1c4ff6