linux-cve-announce - CVE-2025-39701: ACPI: pfr_update: Fix the driver update version check

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Message-ID: <2025090548-CVE-2025-39701-ce5e@gregkh>
Date: Fri,  5 Sep 2025 19:21:14 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39701: ACPI: pfr_update: Fix the driver update version check

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

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

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

ACPI: pfr_update: Fix the driver update version check

The security-version-number check should be used rather
than the runtime version check for driver updates.

Otherwise, the firmware update would fail when the update binary had
a lower runtime version number than the current one.

[ rjw: Changelog edits ]

The Linux kernel CVE team has assigned CVE-2025-39701 to this issue.


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

	Issue introduced in 5.17 with commit 0db89fa243e5edc5de38c88b369e4c3755c5fb74 and fixed in 6.1.149 with commit 79300ff532bccbbf654992c7c0863b49a6c3973c
	Issue introduced in 5.17 with commit 0db89fa243e5edc5de38c88b369e4c3755c5fb74 and fixed in 6.6.103 with commit cf0a88124e357bffda487cbf3cb612bb97eb97e4
	Issue introduced in 5.17 with commit 0db89fa243e5edc5de38c88b369e4c3755c5fb74 and fixed in 6.12.44 with commit b00219888c11519ef75d988fa8a780da68ff568e
	Issue introduced in 5.17 with commit 0db89fa243e5edc5de38c88b369e4c3755c5fb74 and fixed in 6.16.4 with commit 908094681f645d3a78e18ef90561a97029e2df7b
	Issue introduced in 5.17 with commit 0db89fa243e5edc5de38c88b369e4c3755c5fb74 and fixed in 6.17-rc3 with commit 8151320c747efb22d30b035af989fed0d502176e

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-2025-39701
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/acpi/pfr_update.c
	include/uapi/linux/pfrut.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/79300ff532bccbbf654992c7c0863b49a6c3973c
	https://git.kernel.org/stable/c/cf0a88124e357bffda487cbf3cb612bb97eb97e4
	https://git.kernel.org/stable/c/b00219888c11519ef75d988fa8a780da68ff568e
	https://git.kernel.org/stable/c/908094681f645d3a78e18ef90561a97029e2df7b
	https://git.kernel.org/stable/c/8151320c747efb22d30b035af989fed0d502176e