linux-cve-announce - CVE-2022-50852: wifi: mt76: mt7921: fix use after free in mt7921_acpi

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Message-ID: <2025123045-CVE-2022-50852-978e@gregkh>
Date: Tue, 30 Dec 2025 13:19:48 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50852: wifi: mt76: mt7921: fix use after free in mt7921_acpi_read()

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

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

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

wifi: mt76: mt7921: fix use after free in mt7921_acpi_read()

Don't dereference "sar_root" after it has been freed.

The Linux kernel CVE team has assigned CVE-2022-50852 to this issue.


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

	Issue introduced in 6.0 with commit f965333e491e36adb0fa91e389fba8685b704fb6 and fixed in 6.0.3 with commit 3ed0b382cb36f6dac9f93b3a5533cfcd699409a5
	Issue introduced in 6.0 with commit f965333e491e36adb0fa91e389fba8685b704fb6 and fixed in 6.1 with commit e7de4b4979bd8d313ec837931dde936653ca82ea

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-2022-50852
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/net/wireless/mediatek/mt76/mt7921/acpi_sar.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/3ed0b382cb36f6dac9f93b3a5533cfcd699409a5
	https://git.kernel.org/stable/c/e7de4b4979bd8d313ec837931dde936653ca82ea