linux-cve-announce - CVE-2025-68317: io_uring/zctx: check chained notif contexts

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Message-ID: <2025121656-CVE-2025-68317-28c8@gregkh>
Date: Tue, 16 Dec 2025 16:40:00 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68317: io_uring/zctx: check chained notif contexts

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

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

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

io_uring/zctx: check chained notif contexts

Send zc only links ubuf_info for requests coming from the same context.
There are some ambiguous syz reports, so let's check the assumption on
notification completion.

The Linux kernel CVE team has assigned CVE-2025-68317 to this issue.


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

	Fixed in 6.12.58 with commit aaafd17d3f4be2c15539359a5b4bfa00237f687f
	Fixed in 6.17.8 with commit d664a3ce3a604231a0b144c152a3755d03b18b60
	Fixed in 6.18 with commit ab3ea6eac5f45669b091309f592c4ea324003053

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-2025-68317
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/notif.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/aaafd17d3f4be2c15539359a5b4bfa00237f687f
	https://git.kernel.org/stable/c/d664a3ce3a604231a0b144c152a3755d03b18b60
	https://git.kernel.org/stable/c/ab3ea6eac5f45669b091309f592c4ea324003053