linux-cve-announce - CVE-2025-38297: PM: EM: Fix potential division-by-zero error in em_compute

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025071012-CVE-2025-38297-9dee@gregkh>
Date: Thu, 10 Jul 2025 09:42:38 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38297: PM: EM: Fix potential division-by-zero error in em_compute_costs()

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

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

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

PM: EM: Fix potential division-by-zero error in em_compute_costs()

When the device is of a non-CPU type, table[i].performance won't be
initialized in the previous em_init_performance(), resulting in division
by zero when calculating costs in em_compute_costs().

Since the 'cost' algorithm is only used for EAS energy efficiency
calculations and is currently not utilized by other device drivers, we
should add the _is_cpu_device(dev) check to prevent this division-by-zero
issue.

The Linux kernel CVE team has assigned CVE-2025-38297 to this issue.


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

	Issue introduced in 6.9 with commit 1b600da510735a0f92c8b4140a7e2cb037a6a6c3 and fixed in 6.12.34 with commit 81d72f9241d884ec29524431f74f8009310cfa0c
	Issue introduced in 6.9 with commit 1b600da510735a0f92c8b4140a7e2cb037a6a6c3 and fixed in 6.15.3 with commit 14cbdd64f3870cf0a2d94b87919b9056448c59a0
	Issue introduced in 6.9 with commit 1b600da510735a0f92c8b4140a7e2cb037a6a6c3 and fixed in 6.16-rc1 with commit 179c0c7044a378198adb36f2a12410ab68cc730a

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-2025-38297
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:
	kernel/power/energy_model.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/81d72f9241d884ec29524431f74f8009310cfa0c
	https://git.kernel.org/stable/c/14cbdd64f3870cf0a2d94b87919b9056448c59a0
	https://git.kernel.org/stable/c/179c0c7044a378198adb36f2a12410ab68cc730a