linux-cve-announce - CVE-2023-54030: io_uring/net: don't overflow multishot recv

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Message-ID: <2025122436-CVE-2023-54030-e7f3@gregkh>
Date: Wed, 24 Dec 2025 11:57:14 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54030: io_uring/net: don't overflow multishot recv

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

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

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

io_uring/net: don't overflow multishot recv

Don't allow overflowing multishot recv CQEs, it might get out of
hand, hurt performance, and in the worst case scenario OOM the task.

The Linux kernel CVE team has assigned CVE-2023-54030 to this issue.


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

	Issue introduced in 6.0 with commit b3fdea6ecb55c3ceea866ff66486927e51a982b3 and fixed in 6.5.3 with commit 1e2db9837be7d24a2a74eb3f3906d0872bee8907
	Issue introduced in 6.0 with commit b3fdea6ecb55c3ceea866ff66486927e51a982b3 and fixed in 6.6 with commit b2e74db55dd93d6db22a813c9a775b5dbf87c560

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-2023-54030
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/1e2db9837be7d24a2a74eb3f3906d0872bee8907
	https://git.kernel.org/stable/c/b2e74db55dd93d6db22a813c9a775b5dbf87c560