linux-cve-announce - CVE-2024-50075: xhci: tegra: fix checked USB2 port number

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Message-ID: <2024102935-CVE-2024-50075-81b7@gregkh>
Date: Tue, 29 Oct 2024 01:50:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50075: xhci: tegra: fix checked USB2 port number

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

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

xhci: tegra: fix checked USB2 port number

If USB virtualizatoin is enabled, USB2 ports are shared between all
Virtual Functions. The USB2 port number owned by an USB2 root hub in
a Virtual Function may be less than total USB2 phy number supported
by the Tegra XUSB controller.

Using total USB2 phy number as port number to check all PORTSC values
would cause invalid memory access.

[  116.923438] Unable to handle kernel paging request at virtual address 006c622f7665642f
...
[  117.213640] Call trace:
[  117.216783]  tegra_xusb_enter_elpg+0x23c/0x658
[  117.222021]  tegra_xusb_runtime_suspend+0x40/0x68
[  117.227260]  pm_generic_runtime_suspend+0x30/0x50
[  117.232847]  __rpm_callback+0x84/0x3c0
[  117.237038]  rpm_suspend+0x2dc/0x740
[  117.241229] pm_runtime_work+0xa0/0xb8
[  117.245769]  process_scheduled_works+0x24c/0x478
[  117.251007]  worker_thread+0x23c/0x328
[  117.255547]  kthread+0x104/0x1b0
[  117.259389]  ret_from_fork+0x10/0x20
[  117.263582] Code: 54000222 f9461ae8 f8747908 b4ffff48 (f9400100)

The Linux kernel CVE team has assigned CVE-2024-50075 to this issue.


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

	Issue introduced in 6.3 with commit a30951d31b25 and fixed in 6.6.58 with commit 9c696bf4ab54
	Issue introduced in 6.3 with commit a30951d31b25 and fixed in 6.11.5 with commit c46555f14b71
	Issue introduced in 6.3 with commit a30951d31b25 and fixed in 6.12-rc4 with commit 7d381137cb6e

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-2024-50075
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-tegra.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/9c696bf4ab54c7cec81221887564305f0ceeac0a
	https://git.kernel.org/stable/c/c46555f14b71f95a447f5d49fc3f1f80a1472da2
	https://git.kernel.org/stable/c/7d381137cb6ecf558ef6698c7730ddd482d4c8f2