linux-cve-announce - CVE-2024-50269: usb: musb: sunxi: Fix accessing an released usb phy

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Message-ID: <2024111926-CVE-2024-50269-830b@gregkh>
Date: Tue, 19 Nov 2024 02:32:24 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50269: usb: musb: sunxi: Fix accessing an released usb phy

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

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

usb: musb: sunxi: Fix accessing an released usb phy

Commit 6ed05c68cbca ("usb: musb: sunxi: Explicitly release USB PHY on
exit") will cause that usb phy @glue->xceiv is accessed after released.

1) register platform driver @sunxi_musb_driver
// get the usb phy @glue->xceiv
sunxi_musb_probe() -> devm_usb_get_phy().

2) register and unregister platform driver @musb_driver
musb_probe() -> sunxi_musb_init()
use the phy here
//the phy is released here
musb_remove() -> sunxi_musb_exit() -> devm_usb_put_phy()

3) register @musb_driver again
musb_probe() -> sunxi_musb_init()
use the phy here but the phy has been released at 2).
...

Fixed by reverting the commit, namely, removing devm_usb_put_phy()
from sunxi_musb_exit().

The Linux kernel CVE team has assigned CVE-2024-50269 to this issue.


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

	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 4.19.324 with commit 721ddad94559
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 5.4.286 with commit 4aa77d5ea994
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 5.10.230 with commit 6e2848d1c8c0
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 5.15.172 with commit 63559ba8077c
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 6.1.117 with commit ccd811c304d2
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 6.6.61 with commit 8a30da5aa960
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 6.11.8 with commit b08baa75b989
	Issue introduced in 4.14 with commit 6ed05c68cbca and fixed in 6.12 with commit 498dbd9aea20
	Issue introduced in 4.4.95 with commit 583a4219841d
	Issue introduced in 4.9.59 with commit b4ecc15d6f5a
	Issue introduced in 4.13.10 with commit a2259ebaa933

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-2024-50269
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/musb/sunxi.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/721ddad945596220c123eb6f7126729fe277ee4f
	https://git.kernel.org/stable/c/4aa77d5ea9944468e16c3eed15e858fd5de44de1
	https://git.kernel.org/stable/c/6e2848d1c8c0139161e69ac0a94133e90e9988e8
	https://git.kernel.org/stable/c/63559ba8077cbadae1c92a65b73ea522bf377dd9
	https://git.kernel.org/stable/c/ccd811c304d2ee56189bfbc49302cb3c44361893
	https://git.kernel.org/stable/c/8a30da5aa9609663b3e05bcc91a916537f66a4cd
	https://git.kernel.org/stable/c/b08baa75b989cf779cbfa0969681f8ba2dc46569
	https://git.kernel.org/stable/c/498dbd9aea205db9da674994b74c7bf8e18448bd