linux-cve-announce - CVE-2022-49426: iommu/arm-smmu-v3-sva: Fix mm use-after-free

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Message-ID: <2025022655-CVE-2022-49426-313d@gregkh>
Date: Wed, 26 Feb 2025 03:11:40 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49426: iommu/arm-smmu-v3-sva: Fix mm use-after-free

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

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

iommu/arm-smmu-v3-sva: Fix mm use-after-free

We currently call arm64_mm_context_put() without holding a reference to
the mm, which can result in use-after-free. Call mmgrab()/mmdrop() to
ensure the mm only gets freed after we unpinned the ASID.

The Linux kernel CVE team has assigned CVE-2022-49426 to this issue.


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

	Issue introduced in 5.11 with commit 32784a9562fb0518b12e9797ee2aec52214adf6f and fixed in 5.15.46 with commit fc90f13ea0dcd960e5002d204fa55cec4e0db2fa
	Issue introduced in 5.11 with commit 32784a9562fb0518b12e9797ee2aec52214adf6f and fixed in 5.17.14 with commit e3cbbdbff8a4db5d053c53fd71be62ccccdb52b0
	Issue introduced in 5.11 with commit 32784a9562fb0518b12e9797ee2aec52214adf6f and fixed in 5.18.3 with commit 9aa215450888cf29af0c479e14a712dc6b0c506c
	Issue introduced in 5.11 with commit 32784a9562fb0518b12e9797ee2aec52214adf6f and fixed in 5.19 with commit cbd23144f7662b00bcde32a938c4a4057e476d68

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-2022-49426
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/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.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/fc90f13ea0dcd960e5002d204fa55cec4e0db2fa
	https://git.kernel.org/stable/c/e3cbbdbff8a4db5d053c53fd71be62ccccdb52b0
	https://git.kernel.org/stable/c/9aa215450888cf29af0c479e14a712dc6b0c506c
	https://git.kernel.org/stable/c/cbd23144f7662b00bcde32a938c4a4057e476d68