linux-cve-announce - CVE-2025-40056: vhost: vringh: Fix copy_to

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Message-ID: <2025102815-CVE-2025-40056-0a6b@gregkh>
Date: Tue, 28 Oct 2025 12:48:33 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40056: vhost: vringh: Fix copy_to_iter return value check

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

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

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

vhost: vringh: Fix copy_to_iter return value check

The return value of copy_to_iter can't be negative, check whether the
copied length is equal to the requested length instead of checking for
negative values.

The Linux kernel CVE team has assigned CVE-2025-40056 to this issue.


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

	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.1.156 with commit bd71e7e0a612740e4de5524880c7cd40293af5f7
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.6.112 with commit 781226e11d5bdea0d69c7b5aa3cda874093c73b8
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.12.53 with commit b3a950d236e98440c07405ba597b11bce56a8050
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.17.3 with commit 68aac2b335d474b938d154b9c95cbc58838cb2ce
	Issue introduced in 6.0 with commit 309bba39c945ac8ab8083ac05cd6cfe5822968e0 and fixed in 6.18-rc1 with commit 439263376c2c4e126cac0d07e4987568de4eaba5

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-2025-40056
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/bd71e7e0a612740e4de5524880c7cd40293af5f7
	https://git.kernel.org/stable/c/781226e11d5bdea0d69c7b5aa3cda874093c73b8
	https://git.kernel.org/stable/c/b3a950d236e98440c07405ba597b11bce56a8050
	https://git.kernel.org/stable/c/68aac2b335d474b938d154b9c95cbc58838cb2ce
	https://git.kernel.org/stable/c/439263376c2c4e126cac0d07e4987568de4eaba5