linux-cve-announce - CVE-2025-38366: LoongArch: KVM: Check validity of "num

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Message-ID: <2025072558-CVE-2025-38366-26b8@gregkh>
Date: Fri, 25 Jul 2025 14:48:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38366: LoongArch: KVM: Check validity of "num_cpu" from user space

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

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

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

LoongArch: KVM: Check validity of "num_cpu" from user space

The maximum supported cpu number is EIOINTC_ROUTE_MAX_VCPUS about
irqchip EIOINTC, here add validation about cpu number to avoid array
pointer overflow.

The Linux kernel CVE team has assigned CVE-2025-38366 to this issue.


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

	Issue introduced in 6.13 with commit 1ad7efa552fd5cf4e8c49fea863c5c6a5dcf9f00 and fixed in 6.15.5 with commit a3293b4078ee93174f70f36d3ab7618554ce6ab6
	Issue introduced in 6.13 with commit 1ad7efa552fd5cf4e8c49fea863c5c6a5dcf9f00 and fixed in 6.16-rc4 with commit cc8d5b209e09d3b52bca1ffe00045876842d96ae

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-2025-38366
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:
	arch/loongarch/kvm/intc/eiointc.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/a3293b4078ee93174f70f36d3ab7618554ce6ab6
	https://git.kernel.org/stable/c/cc8d5b209e09d3b52bca1ffe00045876842d96ae