linux-cve-announce - CVE-2025-40117: misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test

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Message-ID: <2025111251-CVE-2025-40117-82a4@gregkh>
Date: Wed, 12 Nov 2025 19:23:53 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40117: misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()

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

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

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

misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()

Commit eefb83790a0d ("misc: pci_endpoint_test: Add doorbell test case")
added NO_BAR (-1) to the pci_barno enum which, in practical terms,
changes the enum from an unsigned int to a signed int.  If the user
passes a negative number in pci_endpoint_test_ioctl() then it results in
an array underflow in pci_endpoint_test_bar().

The Linux kernel CVE team has assigned CVE-2025-40117 to this issue.


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

	Issue introduced in 6.17 with commit eefb83790a0dda112d1755e4f5e213738d717e76 and fixed in 6.17.3 with commit 6df3687922570f753574c40b35e83b26b32292d0
	Issue introduced in 6.17 with commit eefb83790a0dda112d1755e4f5e213738d717e76 and fixed in 6.18-rc1 with commit 1ad82f9db13d85667366044acdfb02009d576c5a

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-2025-40117
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/misc/pci_endpoint_test.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/6df3687922570f753574c40b35e83b26b32292d0
	https://git.kernel.org/stable/c/1ad82f9db13d85667366044acdfb02009d576c5a