linux-cve-announce - CVE-2023-53002: drm/i915: Fix a memory leak with reused mmap

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Message-ID: <2025032712-CVE-2023-53002-1f76@gregkh>
Date: Thu, 27 Mar 2025 17:43:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-53002: drm/i915: Fix a memory leak with reused mmap_offset

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

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

drm/i915: Fix a memory leak with reused mmap_offset

drm_vma_node_allow() and drm_vma_node_revoke() should be called in
balanced pairs. We call drm_vma_node_allow() once per-file everytime a
user calls mmap_offset, but only call drm_vma_node_revoke once per-file
on each mmap_offset. As the mmap_offset is reused by the client, the
per-file vm_count may remain non-zero and the rbtree leaked.

Call drm_vma_node_allow_once() instead to prevent that memory leak.

The Linux kernel CVE team has assigned CVE-2023-53002 to this issue.


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

	Issue introduced in 5.7 with commit 7865559872074a9ab169c87915504661d630addf and fixed in 6.1.9 with commit 0bdc4b4ba7206c452ee81c82fa66e39d0e1780fb
	Issue introduced in 5.7 with commit 7865559872074a9ab169c87915504661d630addf and fixed in 6.2 with commit 0220e4fe178c3390eb0291cdb34912d66972db8a

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-2023-53002
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/i915/gem/i915_gem_mman.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/0bdc4b4ba7206c452ee81c82fa66e39d0e1780fb
	https://git.kernel.org/stable/c/0220e4fe178c3390eb0291cdb34912d66972db8a