linux-cve-announce - CVE-2025-40192: Revert "ipmi: fix msg stack when IPMI is disconnected"

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Message-ID: <2025111245-CVE-2025-40192-6344@gregkh>
Date: Wed, 12 Nov 2025 17:00:55 -0500
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40192: Revert "ipmi: fix msg stack when IPMI is disconnected"

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

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

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

Revert "ipmi: fix msg stack when IPMI is disconnected"

This reverts commit c608966f3f9c2dca596967501d00753282b395fc.

This patch has a subtle bug that can cause the IPMI driver to go into an
infinite loop if the BMC misbehaves in a certain way.  Apparently
certain BMCs do misbehave this way because several reports have come in
recently about this.

The Linux kernel CVE team has assigned CVE-2025-40192 to this issue.


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

	Issue introduced in 6.2 with commit c608966f3f9c2dca596967501d00753282b395fc and fixed in 6.6.113 with commit f4aab940ae9eb3ba32e5332b35703673f00d7f37
	Issue introduced in 6.2 with commit c608966f3f9c2dca596967501d00753282b395fc and fixed in 6.12.54 with commit b9cc7155e65f6feca51bfedd543b9bd300e2be2b
	Issue introduced in 6.2 with commit c608966f3f9c2dca596967501d00753282b395fc and fixed in 6.17.4 with commit 8cf5c24533b8058910fcb83a25a9cf0306383780
	Issue introduced in 6.2 with commit c608966f3f9c2dca596967501d00753282b395fc and fixed in 6.18-rc1 with commit 5d09ee1bec870263f4ace439402ea840503b503b

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-2025-40192
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/ipmi/ipmi_kcs_sm.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/f4aab940ae9eb3ba32e5332b35703673f00d7f37
	https://git.kernel.org/stable/c/b9cc7155e65f6feca51bfedd543b9bd300e2be2b
	https://git.kernel.org/stable/c/8cf5c24533b8058910fcb83a25a9cf0306383780
	https://git.kernel.org/stable/c/5d09ee1bec870263f4ace439402ea840503b503b