linux-cve-announce - CVE-2025-38504: io_uring/zcrx: fix pp destruction warnings

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Message-ID: <2025081646-CVE-2025-38504-9fa7@gregkh>
Date: Sat, 16 Aug 2025 12:57:46 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38504: io_uring/zcrx: fix pp destruction warnings

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

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

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

io_uring/zcrx: fix pp destruction warnings

With multiple page pools and in some other cases we can have allocated
niovs on page pool destruction. Remove a misplaced warning checking that
all niovs are returned to zcrx on io_pp_zc_destroy(). It was reported
before but apparently got lost.

The Linux kernel CVE team has assigned CVE-2025-38504 to this issue.


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

	Issue introduced in 6.15 with commit 34a3e60821ab9f335a58d43a88cccdbefdebdec3 and fixed in 6.15.7 with commit ad9f1b5bed082b9c910e2a24bae0286a70846909
	Issue introduced in 6.15 with commit 34a3e60821ab9f335a58d43a88cccdbefdebdec3 and fixed in 6.16 with commit 203817de269539c062724d97dfa5af3cdf77a3ec

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-2025-38504
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/zcrx.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/ad9f1b5bed082b9c910e2a24bae0286a70846909
	https://git.kernel.org/stable/c/203817de269539c062724d97dfa5af3cdf77a3ec