linux-cve-announce - CVE-2023-54287: tty: serial: imx: disable Ageing Timer interrupt request irq

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Message-ID: <2025123028-CVE-2023-54287-31dd@gregkh>
Date: Tue, 30 Dec 2025 13:23:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54287: tty: serial: imx: disable Ageing Timer interrupt request irq

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

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

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

tty: serial: imx: disable Ageing Timer interrupt request irq

There maybe pending USR interrupt before requesting irq, however
uart_add_one_port has not executed, so there will be kernel panic:
[    0.795668] Unable to handle kernel NULL pointer dereference at virtual addre
ss 0000000000000080
[    0.802701] Mem abort info:
[    0.805367]   ESR = 0x0000000096000004
[    0.808950]   EC = 0x25: DABT (current EL), IL = 32 bits
[    0.814033]   SET = 0, FnV = 0
[    0.816950]   EA = 0, S1PTW = 0
[    0.819950]   FSC = 0x04: level 0 translation fault
[    0.824617] Data abort info:
[    0.827367]   ISV = 0, ISS = 0x00000004
[    0.831033]   CM = 0, WnR = 0
[    0.833866] [0000000000000080] user address but active_mm is swapper
[    0.839951] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
[    0.845953] Modules linked in:
[    0.848869] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.1.1+g56321e101aca #1
[    0.855617] Hardware name: Freescale i.MX8MP EVK (DT)
[    0.860452] pstate: 000000c5 (nzcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    0.867117] pc : __imx_uart_rxint.constprop.0+0x11c/0x2c0
[    0.872283] lr : imx_uart_int+0xf8/0x1ec

The issue only happends in the inmate linux when Jailhouse hypervisor
enabled. The test procedure is:
while true; do
	jailhouse enable imx8mp.cell
	jailhouse cell linux xxxx
	sleep 10
	jailhouse cell destroy 1
	jailhouse disable
	sleep 5
done

And during the upper test, press keys to the 2nd linux console.
When `jailhouse cell destroy 1`, the 2nd linux has no chance to put
the uart to a quiese state, so USR1/2 may has pending interrupts. Then
when `jailhosue cell linux xx` to start 2nd linux again, the issue
trigger.

In order to disable irqs before requesting them, both UCR1 and UCR2 irqs
should be disabled, so here fix that, disable the Ageing Timer interrupt
in UCR2 as UCR1 does.

The Linux kernel CVE team has assigned CVE-2023-54287 to this issue.


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

	Issue introduced in 4.3 with commit 8a61f0c70ae65c6b70d13228c3120c73d7425a60 and fixed in 5.15.99 with commit 3d41d9b256ae626c0dc434427c8e32450358d3b4
	Issue introduced in 4.3 with commit 8a61f0c70ae65c6b70d13228c3120c73d7425a60 and fixed in 6.1.16 with commit 9795ece3a85ba9238191e97665586e2d79703ff3
	Issue introduced in 4.3 with commit 8a61f0c70ae65c6b70d13228c3120c73d7425a60 and fixed in 6.2.3 with commit 963875b0655197281775b0ea614aab8b6b3eb001
	Issue introduced in 4.3 with commit 8a61f0c70ae65c6b70d13228c3120c73d7425a60 and fixed in 6.3 with commit ef25e16ea9674b713a68c3bda821556ce9901254

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-2023-54287
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/tty/serial/imx.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/3d41d9b256ae626c0dc434427c8e32450358d3b4
	https://git.kernel.org/stable/c/9795ece3a85ba9238191e97665586e2d79703ff3
	https://git.kernel.org/stable/c/963875b0655197281775b0ea614aab8b6b3eb001
	https://git.kernel.org/stable/c/ef25e16ea9674b713a68c3bda821556ce9901254