---
id: CVE-2026-80954
title: >-
  i3c: Fix unlocked dereference of dev->desc in
  i3c_device_get_supported_xfer_mode()
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  i3c: Fix unlocked dereference of dev->desc in
  i3c_device_get_supported_xfer_mode()


  i3c_device_get_supported_xfer_mode() uses dev->desc to obtain the

  master controller.…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 <
    251db58324ea4792c3f9f692ab09be148e051969
  - >-
    Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 <
    8bed7f4fa710914b7f05fd59998316bfb4d43385
  - Linux 6.19
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:45:38.169Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80954'
references:
  - url: 'https://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969'
  - url: 'https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80954.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80954'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532524'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80954'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80954'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80954.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00165
epssPercentile: 0.05681
scores:
  cna: 7.8
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

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

i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()

i3c_device_get_supported_xfer_mode() uses dev->desc to obtain the
master controller.  However, dev->desc must not be dereferenced unless
bus->lock is held, and this function does not take that lock.

The function only needs access to the master controller associated with
the device's bus.  Use dev->bus instead, which is always valid for the
lifetime of the device and does not require dereferencing dev->desc.

## Affected

- `Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 < 251db58324ea4792c3f9f692ab09be148e051969`
- `Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 < 8bed7f4fa710914b7f05fd59998316bfb4d43385`
- `Linux 6.19`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80954.json)