linux-cve-announce - CVE-2025-40051: vhost: vringh: Modify the return value check

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Message-ID: <2025102814-CVE-2025-40051-7b58@gregkh>
Date: Tue, 28 Oct 2025 12:48:28 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40051: vhost: vringh: Modify the return value check

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

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

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

vhost: vringh: Modify the return value check

The return value of copy_from_iter and copy_to_iter can't be negative,
check whether the copied lengths are equal.

The Linux kernel CVE team has assigned CVE-2025-40051 to this issue.


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

	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.1.156 with commit db042925a5ab7a550b710addeadbf6f72e3a8a4b
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.6.112 with commit 78dc7362662fedaa1928fb8e4f27401c8322905d
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.12.53 with commit baa37b1c7e29546f79c39bef0d18c4edc9f39bb1
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.17.3 with commit cfa0654402c06d086201a9ff167eb95da5844fc3
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.18-rc1 with commit 82a8d0fda55b35361ee7f35b54fa2b66d7847d2b

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-2025-40051
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/vhost/vringh.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/db042925a5ab7a550b710addeadbf6f72e3a8a4b
	https://git.kernel.org/stable/c/78dc7362662fedaa1928fb8e4f27401c8322905d
	https://git.kernel.org/stable/c/baa37b1c7e29546f79c39bef0d18c4edc9f39bb1
	https://git.kernel.org/stable/c/cfa0654402c06d086201a9ff167eb95da5844fc3
	https://git.kernel.org/stable/c/82a8d0fda55b35361ee7f35b54fa2b66d7847d2b