linux-cve-announce - CVE-2022-50562: tpm: acpi: Call acpi_put

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Message-ID: <2025102206-CVE-2022-50562-5b54@gregkh>
Date: Wed, 22 Oct 2025 15:24:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50562: tpm: acpi: Call acpi_put_table() to fix memory leak

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

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

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

tpm: acpi: Call acpi_put_table() to fix memory leak

The start and length of the event log area are obtained from
TPM2 or TCPA table, so we call acpi_get_table() to get the
ACPI information, but the acpi_get_table() should be coupled with
acpi_put_table() to release the ACPI memory, add the acpi_put_table()
properly to fix the memory leak.

While we are at it, remove the redundant empty line at the
end of the tpm_read_log_acpi().

The Linux kernel CVE team has assigned CVE-2022-50562 to this issue.


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

	Issue introduced in 4.18 with commit 0bfb23746052168620c5b52f49d8a47c3bb022fa and fixed in 5.10.163 with commit 8ddc48068ac85740d3d5f9f3b0b323e733a35b33
	Issue introduced in 4.18 with commit 0bfb23746052168620c5b52f49d8a47c3bb022fa and fixed in 5.15.87 with commit 638cd298dfebce46919cbd6cf1884701215f506d
	Issue introduced in 4.18 with commit 0bfb23746052168620c5b52f49d8a47c3bb022fa and fixed in 6.0.17 with commit 694a3d66f493afd77c704c6de91d9be4d6e004e4
	Issue introduced in 4.18 with commit 0bfb23746052168620c5b52f49d8a47c3bb022fa and fixed in 6.1.3 with commit bf31e3f8077af539feaf4e9bbf82e8eb51e7e5a8
	Issue introduced in 4.18 with commit 0bfb23746052168620c5b52f49d8a47c3bb022fa and fixed in 6.2 with commit 8740a12ca2e2959531ad253bac99ada338b33d80

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-2022-50562
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/char/tpm/eventlog/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/8ddc48068ac85740d3d5f9f3b0b323e733a35b33
	https://git.kernel.org/stable/c/638cd298dfebce46919cbd6cf1884701215f506d
	https://git.kernel.org/stable/c/694a3d66f493afd77c704c6de91d9be4d6e004e4
	https://git.kernel.org/stable/c/bf31e3f8077af539feaf4e9bbf82e8eb51e7e5a8
	https://git.kernel.org/stable/c/8740a12ca2e2959531ad253bac99ada338b33d80