linux-cve-announce - CVE-2022-49791: io_uring: fix multishot accept request leaks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025050122-CVE-2022-49791-3e63@gregkh>
Date: Thu,  1 May 2025 16:09:41 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49791: io_uring: fix multishot accept request leaks

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

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

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

io_uring: fix multishot accept request leaks

Having REQ_F_POLLED set doesn't guarantee that the request is
executed as a multishot from the polling path. Fortunately for us, if
the code thinks it's multishot issue when it's not, it can only ask to
skip completion so leaking the request. Use issue_flags to mark
multipoll issues.

The Linux kernel CVE team has assigned CVE-2022-49791 to this issue.


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

	Issue introduced in 5.19 with commit 390ed29b5e425ba00da2b6113b74a14949f71b02 and fixed in 6.0.10 with commit 0e4626de856ef8f25ecd9c716e76d4f95ce95639
	Issue introduced in 5.19 with commit 390ed29b5e425ba00da2b6113b74a14949f71b02 and fixed in 6.1 with commit 91482864768a874c4290ef93b84a78f4f1dac51b

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-2022-49791
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:
	include/linux/io_uring.h
	io_uring/io_uring.c
	io_uring/io_uring.h
	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/0e4626de856ef8f25ecd9c716e76d4f95ce95639
	https://git.kernel.org/stable/c/91482864768a874c4290ef93b84a78f4f1dac51b