linux-cve-announce - CVE-2025-68330: iio: accel: bmc150: Fix irq assumption regression

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Message-ID: <2025122218-CVE-2025-68330-94b5@gregkh>
Date: Mon, 22 Dec 2025 17:14:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68330: iio: accel: bmc150: Fix irq assumption regression

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

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

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

iio: accel: bmc150: Fix irq assumption regression

The code in bmc150-accel-core.c unconditionally calls
bmc150_accel_set_interrupt() in the iio_buffer_setup_ops,
such as on the runtime PM resume path giving a kernel
splat like this if the device has no interrupts:

Unable to handle kernel NULL pointer dereference at virtual
  address 00000001 when read

PC is at bmc150_accel_set_interrupt+0x98/0x194
LR is at __pm_runtime_resume+0x5c/0x64
(...)
Call trace:
bmc150_accel_set_interrupt from bmc150_accel_buffer_postenable+0x40/0x108
bmc150_accel_buffer_postenable from __iio_update_buffers+0xbe0/0xcbc
__iio_update_buffers from enable_store+0x84/0xc8
enable_store from kernfs_fop_write_iter+0x154/0x1b4

This bug seems to have been in the driver since the beginning,
but it only manifests recently, I do not know why.

Store the IRQ number in the state struct, as this is a common
pattern in other drivers, then use this to determine if we have
IRQ support or not.

The Linux kernel CVE team has assigned CVE-2025-68330 to this issue.


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

	Fixed in 5.15.197 with commit aad9d048a3211c48ec02efa405bf462856feb862
	Fixed in 6.1.159 with commit c891f504bb66604c822e7985e093cf39b97fdeb0
	Fixed in 6.6.119 with commit cdd4a9e98004bd7c7488311951fa6dbae38b2b80
	Fixed in 6.12.61 with commit 65ad4ed983fd9ee0259d86391d6a53f78203918c
	Fixed in 6.17.11 with commit 93eaa5ddc5fc4f50ac396afad8ce261102ebd4f3
	Fixed in 6.18 with commit 3aa385a9c75c09b59dcab2ff76423439d23673ab

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-2025-68330
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/iio/accel/bmc150-accel-core.c
	drivers/iio/accel/bmc150-accel.h


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/aad9d048a3211c48ec02efa405bf462856feb862
	https://git.kernel.org/stable/c/c891f504bb66604c822e7985e093cf39b97fdeb0
	https://git.kernel.org/stable/c/cdd4a9e98004bd7c7488311951fa6dbae38b2b80
	https://git.kernel.org/stable/c/65ad4ed983fd9ee0259d86391d6a53f78203918c
	https://git.kernel.org/stable/c/93eaa5ddc5fc4f50ac396afad8ce261102ebd4f3
	https://git.kernel.org/stable/c/3aa385a9c75c09b59dcab2ff76423439d23673ab