linux-cve-announce - CVE-2025-39699: iommu/riscv: prevent NULL deref in iova_to

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Message-ID: <2025090548-CVE-2025-39699-4d8c@gregkh>
Date: Fri,  5 Sep 2025 19:21:12 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39699: iommu/riscv: prevent NULL deref in iova_to_phys

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

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

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

iommu/riscv: prevent NULL deref in iova_to_phys

The riscv_iommu_pte_fetch() function returns either NULL for
unmapped/never-mapped iova, or a valid leaf pte pointer that
requires no further validation.

riscv_iommu_iova_to_phys() failed to handle NULL returns.
Prevent null pointer dereference in
riscv_iommu_iova_to_phys(), and remove the pte validation.

The Linux kernel CVE team has assigned CVE-2025-39699 to this issue.


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

	Issue introduced in 6.13 with commit 488ffbf181718b9ad8c1838cb249d60973e78eda and fixed in 6.16.4 with commit 220c491490255b656672bb572b18460cd9155926
	Issue introduced in 6.13 with commit 488ffbf181718b9ad8c1838cb249d60973e78eda and fixed in 6.17-rc3 with commit 99d4d1a070870aa08163af8ce0522992b7f35d8c

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-2025-39699
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/riscv/iommu.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/220c491490255b656672bb572b18460cd9155926
	https://git.kernel.org/stable/c/99d4d1a070870aa08163af8ce0522992b7f35d8c