linux-cve-announce - CVE-2025-38187: drm/nouveau: fix a use-after-free in r535_gsp_rpc

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Message-ID: <2025070413-CVE-2025-38187-dafd@gregkh>
Date: Fri,  4 Jul 2025 15:37:16 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38187: drm/nouveau: fix a use-after-free in r535_gsp_rpc_push()

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

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

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

drm/nouveau: fix a use-after-free in r535_gsp_rpc_push()

The RPC container is released after being passed to r535_gsp_rpc_send().

When sending the initial fragment of a large RPC and passing the
caller's RPC container, the container will be freed prematurely. Subsequent
attempts to send remaining fragments will therefore result in a
use-after-free.

Allocate a temporary RPC container for holding the initial fragment of a
large RPC when sending. Free the caller's container when all fragments
are successfully sent.

[ Rebase onto Blackwell changes. - Danilo ]

The Linux kernel CVE team has assigned CVE-2025-38187 to this issue.


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

	Issue introduced in 6.7 with commit 176fdcbddfd288408ce8571c1760ad618d962096 and fixed in 6.15.4 with commit cd4677407c0ee250fc21e36439c8a442ddd62cc1
	Issue introduced in 6.7 with commit 176fdcbddfd288408ce8571c1760ad618d962096 and fixed in 6.16-rc3 with commit 9802f0a63b641f4cddb2139c814c2e95cb825099

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-2025-38187
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:
	drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/rpc.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/cd4677407c0ee250fc21e36439c8a442ddd62cc1
	https://git.kernel.org/stable/c/9802f0a63b641f4cddb2139c814c2e95cb825099