From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-43431: xhci: Fix NULL pointer dereference when reading portli debugfs files
Date: Fri, 8 May 2026 16:22:40 +0200 [thread overview]
Message-ID: <2026050850-CVE-2026-43431-1c06@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
xhci: Fix NULL pointer dereference when reading portli debugfs files
Michal reported and debgged a NULL pointer dereference bug in the
recently added portli debugfs files
Oops is caused when there are more port registers counted in
xhci->max_ports than ports reported by Supported Protocol capabilities.
This is possible if max_ports is more than maximum port number, or
if there are gaps between ports of different speeds the 'Supported
Protocol' capabilities.
In such cases port->rhub will be NULL so we can't reach xhci behind it.
Add an explicit NULL check for this case, and print portli in hex
without dereferencing port->rhub.
The Linux kernel CVE team has assigned CVE-2026-43431 to this issue.
Affected and fixed versions
===========================
Issue introduced in 6.19 with commit 384c57ec720597f8104f69082cdd261abb998b80 and fixed in 6.19.9 with commit 9c8bef223c6e991276188d30d74bdb2cbd8be652
Issue introduced in 6.19 with commit 384c57ec720597f8104f69082cdd261abb998b80 and fixed in 7.0 with commit ae4ff9dead5efa2025eddfcdb29411432bf40a7c
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-2026-43431
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-debugfs.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/9c8bef223c6e991276188d30d74bdb2cbd8be652
https://git.kernel.org/stable/c/ae4ff9dead5efa2025eddfcdb29411432bf40a7c
reply other threads:[~2026-05-08 14:25 UTC|newest]
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