---
id: CVE-2026-97593
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX

  When using a 5-level translation table via ZPCI_TABLE_TYPE_RFX
  get_rso_from_iova() returns …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX

  When using a 5-level translation table via ZPCI_TABLE_TYPE_RFX
  get_rso_from_iova() returns …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 81244074b518aeb90de5f68e7e825564c29c5c50 <
    d0502ed0a1aae97e2ab7a21545903ba612d9f02e
  - >-
    Linux >= 81244074b518aeb90de5f68e7e825564c29c5c50 <
    41b5e0ce6801bf04d8fd3bca46e8c393349ebd5c
  - >-
    Linux >= 81244074b518aeb90de5f68e7e825564c29c5c50 <
    20db6573301e66cd65ebf6c130b6563c69374d9d
  - Linux 6.16
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:10.547'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97593'
references:
  - url: 'https://git.kernel.org/stable/c/20db6573301e66cd65ebf6c130b6563c69374d9d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/41b5e0ce6801bf04d8fd3bca46e8c393349ebd5c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d0502ed0a1aae97e2ab7a21545903ba612d9f02e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.905Z'
---

## Overview

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

iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX

When using a 5-level translation table via ZPCI_TABLE_TYPE_RFX
get_rso_from_iova() returns NULL when the region-first entry is invalid.
Yet in get_rto_from_iova() the region-second origin rso is not checked
to be non-NULL before accessing rso[rsx] leading to a NULL pointer
dereference instead of a NULL return when iova_to_phys() is called on
a unmapped IOVA. Fix this by adding the missing NULL check.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.