---
id: CVE-2026-90192
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mailbox: qcom-cpucp: handle NULL data in send_data callback

  mailbox_clear_channel() calls mbox_send_message() with NULL data to
  notify the remote side that the RX chan…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mailbox: qcom-cpucp: handle NULL data in send_data callback

  mailbox_clear_channel() calls mbox_send_message() with NULL data to
  notify the remote side that the RX chan…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 <
    3d11d2a6c9a10de287e0f1b53a5e65d16afe2760
  - >-
    Linux >= 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 <
    413b0b94d6d06b8d49735280e86a01dac90cf177
  - >-
    Linux >= 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 <
    b3d73e7440e0c40644285be1bda349cdf90122d8
  - >-
    Linux >= 0e2a9a03106cd5fa0dbc9047675e7645c55e2669 <
    fc4f2f99530298a1739226947aa76525142d421d
  - Linux 6.11
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:13.920'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90192'
references:
  - url: 'https://git.kernel.org/stable/c/3d11d2a6c9a10de287e0f1b53a5e65d16afe2760'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/413b0b94d6d06b8d49735280e86a01dac90cf177'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b3d73e7440e0c40644285be1bda349cdf90122d8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fc4f2f99530298a1739226947aa76525142d421d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.863Z'
epss: 0.002
epssPercentile: 0.10166
---

## Overview

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

mailbox: qcom-cpucp: handle NULL data in send_data callback

mailbox_clear_channel() calls mbox_send_message() with NULL data to
notify the remote side that the RX channel has been cleared.
qcom_cpucp_mbox_send_data() blindly dereferenced the data pointer,
causing a NULL pointer dereference kernel panic when invoked from
this path under PREEMPT_RT.

Add an explicit NULL check and return early without writing to the
TX register, which is the correct behaviour for a channel-clear
notification.

## Remediation

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