linux-cve-announce - CVE-2023-52930: drm/i915: Fix potential bit

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Message-ID: <2025032719-CVE-2023-52930-4bbc@gregkh>
Date: Thu, 27 Mar 2025 17:37:20 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52930: drm/i915: Fix potential bit_17 double-free

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

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

drm/i915: Fix potential bit_17 double-free

A userspace with multiple threads racing I915_GEM_SET_TILING to set the
tiling to I915_TILING_NONE could trigger a double free of the bit_17
bitmask.  (Or conversely leak memory on the transition to tiled.)  Move
allocation/free'ing of the bitmask within the section protected by the
obj lock.

[tursulin: Correct fixes tag and added cc stable.]
(cherry picked from commit 10e0cbaaf1104f449d695c80bcacf930dcd3c42e)

The Linux kernel CVE team has assigned CVE-2023-52930 to this issue.


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

	Issue introduced in 5.5 with commit 2850748ef8763ab46958e43a4d1c445f29eeb37d and fixed in 5.10.168 with commit b591abac78e25269b12e3d7170c99463f8c5cb02
	Issue introduced in 5.5 with commit 2850748ef8763ab46958e43a4d1c445f29eeb37d and fixed in 5.15.93 with commit e3ebc3e23bd9028a8a9a26cbc5985f99be445f65
	Issue introduced in 5.5 with commit 2850748ef8763ab46958e43a4d1c445f29eeb37d and fixed in 6.1.11 with commit 0769f997a7b6d5cb8336db0b4ec3d2d311b8097c
	Issue introduced in 5.5 with commit 2850748ef8763ab46958e43a4d1c445f29eeb37d and fixed in 6.2 with commit 7057a8f126f14f14b040faecfa220fd27c6c2f85

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-2023-52930
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_tiling.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/b591abac78e25269b12e3d7170c99463f8c5cb02
	https://git.kernel.org/stable/c/e3ebc3e23bd9028a8a9a26cbc5985f99be445f65
	https://git.kernel.org/stable/c/0769f997a7b6d5cb8336db0b4ec3d2d311b8097c
	https://git.kernel.org/stable/c/7057a8f126f14f14b040faecfa220fd27c6c2f85