linux-cve-announce - CVE-2022-49286: tpm: use try_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025022632-CVE-2022-49286-a585@gregkh>
Date: Wed, 26 Feb 2025 02:58:11 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49286: tpm: use try_get_ops() in tpm-space.c

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

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

tpm: use try_get_ops() in tpm-space.c

As part of the series conversion to remove nested TPM operations:

https://lore.kernel.org/all/20190205224723.19671-1-jarkko.sakkinen@linux.intel.com/

exposure of the chip->tpm_mutex was removed from much of the upper
level code.  In this conversion, tpm2_del_space() was missed.  This
didn't matter much because it's usually called closely after a
converted operation, so there's only a very tiny race window where the
chip can be removed before the space flushing is done which causes a
NULL deref on the mutex.  However, there are reports of this window
being hit in practice, so fix this by converting tpm2_del_space() to
use tpm_try_get_ops(), which performs all the teardown checks before
acquring the mutex.

The Linux kernel CVE team has assigned CVE-2022-49286 to this issue.


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

	Fixed in 5.4.188 with commit 5b1d2561a03e534064b51c50c774657833d3d2cf
	Fixed in 5.10.109 with commit 95193d12f10a8a088843b25e0f5fe1d83ec6b079
	Fixed in 5.15.32 with commit 476ddd23f818fb94cf86fb5617f3bb9a7c92113d
	Fixed in 5.16.18 with commit eda1662cce964c8a65bb86321f8d9cfa6e9ceaab
	Fixed in 5.17.1 with commit ba84f9a48366dcc3cdef978599433efe101dd5bd
	Fixed in 5.18 with commit fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9

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-2022-49286
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/tpm2-space.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/5b1d2561a03e534064b51c50c774657833d3d2cf
	https://git.kernel.org/stable/c/95193d12f10a8a088843b25e0f5fe1d83ec6b079
	https://git.kernel.org/stable/c/476ddd23f818fb94cf86fb5617f3bb9a7c92113d
	https://git.kernel.org/stable/c/eda1662cce964c8a65bb86321f8d9cfa6e9ceaab
	https://git.kernel.org/stable/c/ba84f9a48366dcc3cdef978599433efe101dd5bd
	https://git.kernel.org/stable/c/fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9