linux-cve-announce - CVE-2023-52926: io_uring/rw: split io

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Message-ID: <2025022416-CVE-2023-52926-7cb1@gregkh>
Date: Mon, 24 Feb 2025 10:00:17 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52926: io_uring/rw: split io_read() into a helper

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

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

IORING_OP_READ did not correctly consume the provided buffer list when
read i/o returned < 0 (except for -EAGAIN and -EIOCBQUEUED return).
This can lead to a potential use-after-free when the completion via
io_rw_done runs at separate context.

The Linux kernel CVE team has assigned CVE-2023-52926 to this issue.


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

	Fixed in 6.1.122 with commit 72060434a14caea20925e492310d6e680e3f9007
	Fixed in 6.6.68 with commit 6c27fc6a783c8a77c756dd5461b15e465020d075
	Fixed in 6.7 with commit a08d195b586a217d76b42062f88f375a3eedda4d

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-2023-52926
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/rw.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/72060434a14caea20925e492310d6e680e3f9007
	https://git.kernel.org/stable/c/6c27fc6a783c8a77c756dd5461b15e465020d075
	https://git.kernel.org/stable/c/a08d195b586a217d76b42062f88f375a3eedda4d