linux-cve-announce - CVE-2022-49962: xhci: Fix null pointer dereference in remove if xHC has only one roothub

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Message-ID: <2025061814-CVE-2022-49962-aced@gregkh>
Date: Wed, 18 Jun 2025 13:00:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49962: xhci: Fix null pointer dereference in remove if xHC has only one roothub

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

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

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

xhci: Fix null pointer dereference in remove if xHC has only one roothub

The remove path in xhci platform driver tries to remove and put both main
and shared hcds even if only a main hcd exists (one roothub)

This causes a null pointer dereference in reboot for those controllers.

Check that the shared_hcd exists before trying to remove it.

The Linux kernel CVE team has assigned CVE-2022-49962 to this issue.


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

	Issue introduced in 5.19 with commit e0fe986972f5b6b12086c73569206dd29c520be9 and fixed in 5.19.8 with commit 7081b2f34ff291ada012bd6abacaf7d51c4cf73f
	Issue introduced in 5.19 with commit e0fe986972f5b6b12086c73569206dd29c520be9 and fixed in 6.0 with commit 4a593a62a9e3a25ab4bc37f612e4edec144f7f43

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-2022-49962
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-plat.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/7081b2f34ff291ada012bd6abacaf7d51c4cf73f
	https://git.kernel.org/stable/c/4a593a62a9e3a25ab4bc37f612e4edec144f7f43