linux-cve-announce - CVE-2023-53266: arm64: acpi: Fix possible memory leak of ffh

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Message-ID: <2025091602-CVE-2023-53266-f945@gregkh>
Date: Tue, 16 Sep 2025 10:07:04 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53266: arm64: acpi: Fix possible memory leak of ffh_ctxt

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

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

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

arm64: acpi: Fix possible memory leak of ffh_ctxt

Allocated 'ffh_ctxt' memory leak is possible if the SMCCC version
and conduit checks fail and -EOPNOTSUPP is returned without freeing the
allocated memory.

Fix the same by moving the allocation after the SMCCC version and
conduit checks.

The Linux kernel CVE team has assigned CVE-2023-53266 to this issue.


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

	Issue introduced in 6.2 with commit 1d280ce099db396e092cac1aa9bf2ea8beee6d76 and fixed in 6.2.3 with commit 7521da2eb42d65f89f511b7912d3757cf3d9168a
	Issue introduced in 6.2 with commit 1d280ce099db396e092cac1aa9bf2ea8beee6d76 and fixed in 6.3 with commit 1b561d3949f8478c5403c9752b5533211a757226

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-2023-53266
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:
	arch/arm64/kernel/acpi.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/7521da2eb42d65f89f511b7912d3757cf3d9168a
	https://git.kernel.org/stable/c/1b561d3949f8478c5403c9752b5533211a757226