linux-cve-announce - CVE-2025-40202: ipmi: Rework user message limit handling

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Message-ID: <2025111246-CVE-2025-40202-f5ad@gregkh>
Date: Wed, 12 Nov 2025 17:01:05 -0500
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40202: ipmi: Rework user message limit handling

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

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

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

ipmi: Rework user message limit handling

The limit on the number of user messages had a number of issues,
improper counting in some cases and a use after free.

Restructure how this is all done to handle more in the receive message
allocation routine, so all refcouting and user message limit counts
are done in that routine.  It's a lot cleaner and safer.

The Linux kernel CVE team has assigned CVE-2025-40202 to this issue.


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

	Issue introduced in 5.19 with commit 8e76741c3d8b20dfa2d6c30fa10ff927cfd93d82 and fixed in 6.1.157 with commit f63723ca7d7623f9dae1990973cd158671f03c56
	Issue introduced in 5.19 with commit 8e76741c3d8b20dfa2d6c30fa10ff927cfd93d82 and fixed in 6.6.113 with commit 348121b29594d42d1635648fd3ed31dfa25351d5
	Issue introduced in 5.19 with commit 8e76741c3d8b20dfa2d6c30fa10ff927cfd93d82 and fixed in 6.12.54 with commit 53d6e403affbf6df2c859a0ea00ccfc1e72090ca
	Issue introduced in 5.19 with commit 8e76741c3d8b20dfa2d6c30fa10ff927cfd93d82 and fixed in 6.17.4 with commit 0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5
	Issue introduced in 5.19 with commit 8e76741c3d8b20dfa2d6c30fa10ff927cfd93d82 and fixed in 6.18-rc1 with commit b52da4054ee0bf9ecb44996f2c83236ff50b3812

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-2025-40202
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_msghandler.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/f63723ca7d7623f9dae1990973cd158671f03c56
	https://git.kernel.org/stable/c/348121b29594d42d1635648fd3ed31dfa25351d5
	https://git.kernel.org/stable/c/53d6e403affbf6df2c859a0ea00ccfc1e72090ca
	https://git.kernel.org/stable/c/0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5
	https://git.kernel.org/stable/c/b52da4054ee0bf9ecb44996f2c83236ff50b3812