---
id: CVE-2026-89728
title: 'i3c: renesas: Fix out-of-bounds access for newdevs mask'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  i3c: renesas: Fix out-of-bounds access for newdevs mask

  When software initiates DAA (Dynamic Address Assignment), the controller
  reports the result via the NRSPQP (Nor…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-805
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e7218986319b4e903dfb4642dcbd1087cf16aaec <
    769f5a233efcf8587f70fb2244a202d88582c746
  - >-
    Linux >= e7218986319b4e903dfb4642dcbd1087cf16aaec <
    50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd
  - Linux 7.0
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:51:41.560Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89728'
references:
  - url: 'https://git.kernel.org/stable/c/769f5a233efcf8587f70fb2244a202d88582c746'
  - url: 'https://git.kernel.org/stable/c/50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89728.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89728'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532480'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89728'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89728'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89728.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00198
epssPercentile: 0.0946
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

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

i3c: renesas: Fix out-of-bounds access for newdevs mask

When software initiates DAA (Dynamic Address Assignment), the controller
reports the result via the NRSPQP (Normal Response Queue Port Register).
The data length field of the response descriptor, which is accessible
through the NRSPQP register, indicates the number of devices remaining
after DAA. Consequently, when the bus is empty, this field contains the
maximum number of devices supported by the controller (8 for the Renesas
I3C controller).

Adjust the condition that computes the newly discovered devices bitmask
to prevent an out-of-bounds when the I3C bus is empty.

## Affected

- `Linux >= e7218986319b4e903dfb4642dcbd1087cf16aaec < 769f5a233efcf8587f70fb2244a202d88582c746`
- `Linux >= e7218986319b4e903dfb4642dcbd1087cf16aaec < 50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd`
- `Linux 7.0`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89728.json)