linux-cve-announce - CVE-2022-50247: usb: xhci-mtk: fix leakage of shared hcd when fail to set wakeup irq

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Message-ID: <2025091549-CVE-2022-50247-1ab7@gregkh>
Date: Mon, 15 Sep 2025 16:01:55 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50247: usb: xhci-mtk: fix leakage of shared hcd when fail to set wakeup irq

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

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

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

usb: xhci-mtk: fix leakage of shared hcd when fail to set wakeup irq

Can not set the @shared_hcd to NULL before decrease the usage count
by usb_put_hcd(), this will cause the shared hcd not released.

The Linux kernel CVE team has assigned CVE-2022-50247 to this issue.


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

	Issue introduced in 5.13 with commit 04284eb74e0c350be5e75eda178b97063343af13 and fixed in 5.15.86 with commit ffb14aac2658873050671198543b9b8194149c14
	Issue introduced in 5.13 with commit 04284eb74e0c350be5e75eda178b97063343af13 and fixed in 6.0.16 with commit 05680a91ae60ddd0319e6618456f0883b5dd765d
	Issue introduced in 5.13 with commit 04284eb74e0c350be5e75eda178b97063343af13 and fixed in 6.1.2 with commit c8e7463844888dc8344bbb9cbad88cdce9cb8077
	Issue introduced in 5.13 with commit 04284eb74e0c350be5e75eda178b97063343af13 and fixed in 6.2 with commit 03a88b0bafbe3f548729d970d8366f48718c9b19

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-2022-50247
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/usb/host/xhci-mtk.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/ffb14aac2658873050671198543b9b8194149c14
	https://git.kernel.org/stable/c/05680a91ae60ddd0319e6618456f0883b5dd765d
	https://git.kernel.org/stable/c/c8e7463844888dc8344bbb9cbad88cdce9cb8077
	https://git.kernel.org/stable/c/03a88b0bafbe3f548729d970d8366f48718c9b19