linux-cve-announce - CVE-2023-52931: drm/i915: Avoid potential vm use-after-free

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Message-ID: <2025032719-CVE-2023-52931-593f@gregkh>
Date: Thu, 27 Mar 2025 17:37:21 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52931: drm/i915: Avoid potential vm use-after-free

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

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

drm/i915: Avoid potential vm use-after-free

Adding the vm to the vm_xa table makes it visible to userspace, which
could try to race with us to close the vm.  So we need to take our extra
reference before putting it in the table.

(cherry picked from commit 99343c46d4e2b34c285d3d5f68ff04274c2f9fb4)

The Linux kernel CVE team has assigned CVE-2023-52931 to this issue.


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

	Issue introduced in 5.16 with commit 9ec8795e7d91bc650db03dc6f5315667555dae11 and fixed in 6.1.11 with commit 764accc2c1b8fd1507be2e7f436c94cdce887a00
	Issue introduced in 5.16 with commit 9ec8795e7d91bc650db03dc6f5315667555dae11 and fixed in 6.2 with commit 41d419382ec7e257e54b7b6ff0d3623aafb1316d

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-2023-52931
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_context.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/764accc2c1b8fd1507be2e7f436c94cdce887a00
	https://git.kernel.org/stable/c/41d419382ec7e257e54b7b6ff0d3623aafb1316d