linux-cve-announce - CVE-2023-53789: iommu/amd: Improve page fault error reporting

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Message-ID: <2025120940-CVE-2023-53789-c5cb@gregkh>
Date: Tue,  9 Dec 2025 09:02:10 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53789: iommu/amd: Improve page fault error reporting

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

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

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

iommu/amd: Improve page fault error reporting

If IOMMU domain for device group is not setup properly then we may hit
IOMMU page fault. Current page fault handler assumes that domain is
always setup and it will hit NULL pointer derefence (see below sample log).

Lets check whether domain is setup or not and log appropriate message.

Sample log:
----------
 amdgpu 0000:00:01.0: amdgpu: SE 1, SH per SE 1, CU per SH 8, active_cu_number 6
 BUG: kernel NULL pointer dereference, address: 0000000000000058
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 2 PID: 56 Comm: irq/24-AMD-Vi Not tainted 6.2.0-rc2+ #89
 Hardware name: xxx
 RIP: 0010:report_iommu_fault+0x11/0x90
 [...]
 Call Trace:
  <TASK>
  amd_iommu_int_thread+0x60c/0x760
  ? __pfx_irq_thread_fn+0x10/0x10
  irq_thread_fn+0x1f/0x60
  irq_thread+0xea/0x1a0
  ? preempt_count_add+0x6a/0xa0
  ? __pfx_irq_thread_dtor+0x10/0x10
  ? __pfx_irq_thread+0x10/0x10
  kthread+0xe9/0x110
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x2c/0x50
  </TASK>

[joro: Edit commit message]

The Linux kernel CVE team has assigned CVE-2023-53789 to this issue.


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

	Fixed in 6.1.16 with commit be8301e2d5a8b95c04ae8e35d7bfee7b0f03f83a
	Fixed in 6.2.3 with commit 446080b353f048b1fddaec1434cb3d27b5de7efe
	Fixed in 6.3 with commit 996d120b4de2b0d6b592bd9fbbe6e244b81ab3cc

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-2023-53789
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/amd/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/be8301e2d5a8b95c04ae8e35d7bfee7b0f03f83a
	https://git.kernel.org/stable/c/446080b353f048b1fddaec1434cb3d27b5de7efe
	https://git.kernel.org/stable/c/996d120b4de2b0d6b592bd9fbbe6e244b81ab3cc