linux-cve-announce - CVE-2025-68294: io_uring/net: ensure vectored buffer node import is tied to notification

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Message-ID: <2025121641-CVE-2025-68294-fcd2@gregkh>
Date: Tue, 16 Dec 2025 16:06:48 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68294: io_uring/net: ensure vectored buffer node import is tied to notification

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

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

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

io_uring/net: ensure vectored buffer node import is tied to notification

When support for vectored registered buffers was added, the import
itself is using 'req' rather than the notification io_kiocb, sr->notif.
For non-vectored imports, sr->notif is correctly used. This is important
as the lifetime of the two may be different. Use the correct io_kiocb
for the vectored buffer import.

The Linux kernel CVE team has assigned CVE-2025-68294 to this issue.


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

	Issue introduced in 6.15 with commit 23371eac7d9a9bca5360cfb3eb3aa08648ee7246 and fixed in 6.17.11 with commit 14459281e027f23b70885c1cc1032a71c0efd8d7
	Issue introduced in 6.15 with commit 23371eac7d9a9bca5360cfb3eb3aa08648ee7246 and fixed in 6.18 with commit f6041803a831266a2a5a5b5af66f7de0845bcbf3

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-2025-68294
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:
	io_uring/net.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/14459281e027f23b70885c1cc1032a71c0efd8d7
	https://git.kernel.org/stable/c/f6041803a831266a2a5a5b5af66f7de0845bcbf3