---
id: CVE-2026-80951
title: >-
  kernel: i3c: master: svc: bound IBI payload to the requested max_payload_len
  (CVE-2026-80951)
summary: >-
  A flaw was found in the Linux kernel's I3C master driver. A malicious I3C
  device could exploit this by sending an In-Band Interrupt (IBI) payload that
  exceeds the allocated slot size. This can lead to an out-of-bounds write into
  the IBI po…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T17:14:14+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80951.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80951.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80951'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532522'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80951'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80951'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80951.mbox
  - url: 'https://git.kernel.org/stable/c/7c099b0b292a68d0ef558527945dbfb756fbf893'
  - url: 'https://git.kernel.org/stable/c/7cc5ba756bc1cfffab9cb2695742f9f479dc73f7'
  - url: 'https://git.kernel.org/stable/c/35aa6730b8c5626b879a4e893fe664f59bf07d7f'
  - url: 'https://git.kernel.org/stable/c/f296a0d5907bf88314dfda67245f7f69d1552470'
  - url: 'https://git.kernel.org/stable/c/5697d779577e2786ff3348ae9b77020ac0cf0aab'
  - url: 'https://git.kernel.org/stable/c/aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c'
  - url: 'https://git.kernel.org/stable/c/e2bda39d7f9f285ec803e200b5c1f17143d0b483'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00205
epssPercentile: 0.10896
ingestedAt: '2026-09-14T15:23:07.455Z'
---

## Overview

A flaw was found in the Linux kernel's I3C master driver. A malicious I3C device could exploit this by sending an In-Band Interrupt (IBI) payload that exceeds the allocated slot size. This can lead to an out-of-bounds write into the IBI pool, potentially causing memory corruption and system instability.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80951.json)

**kernel: i3c: master: svc: bound IBI payload to the requested max_payload_len** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Affected