linux-cve-announce - CVE-2025-40364: io_uring: fix io_req_prep

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Message-ID: <2025041827-CVE-2025-40364-d93c@gregkh>
Date: Fri, 18 Apr 2025 15:50:28 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40364: io_uring: fix io_req_prep_async with provided buffers

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

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

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

io_uring: fix io_req_prep_async with provided buffers

io_req_prep_async() can import provided buffers, commit the ring state
by giving up on that before, it'll be reimported later if needed.

The Linux kernel CVE team has assigned CVE-2025-40364 to this issue.


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

	Issue introduced in 5.19 with commit c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and fixed in 6.1.129 with commit a1b17713b32c75a90132ea2f92b1257f3bbc20f3
	Issue introduced in 5.19 with commit c7fb19428d67dd0a2a78a4f237af01d39c78dc5a and fixed in 6.6.78 with commit a94592ec30ff67dc36c424327f1e0a9ceeeb9bd3

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-2025-40364
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/io_uring.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/a1b17713b32c75a90132ea2f92b1257f3bbc20f3
	https://git.kernel.org/stable/c/a94592ec30ff67dc36c424327f1e0a9ceeeb9bd3