CVE-2026-72432: tpm_crb: Check ACPI_COMPANION() against NULL during probe

CVE-2026-72432: tpm_crb: Check ACPI_COMPANION() against NULL during probe

[Greg Kroah-Hartman]

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

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

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

tpm_crb: Check ACPI_COMPANION() against NULL during probe

Every platform driver can be forced to match a device that doesn't match
its list of device IDs because of device_match_driver_override(), so
platform drivers that rely on the existence of a device's ACPI companion
object need to verify its presence.

Accordingly, add a requisite ACPI_COMPANION() check against NULL to the
tpm_crb driver.

The Linux kernel CVE team has assigned CVE-2026-72432 to this issue.


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

	Issue introduced in 7.1 with commit 48fe2cddc85c7849463bd01ae8b8c6b575ff508b and fixed in 7.1.5 with commit c041d2be785feb9b5e36331921eadaefbe65349d
	Issue introduced in 7.1 with commit 48fe2cddc85c7849463bd01ae8b8c6b575ff508b and fixed in 7.2-rc1 with commit ddd33806b8911fa2ef849e8bbbab1e3fcb26adc0

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-2026-72432
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/char/tpm/tpm_crb.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/c041d2be785feb9b5e36331921eadaefbe65349d
	https://git.kernel.org/stable/c/ddd33806b8911fa2ef849e8bbbab1e3fcb26adc0