---
id: CVE-2026-45877
title: 'HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients

  During a warm reset flow, the cl->device pointer may be NULL if the
  reset occurs while clients a…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 <
    cde7f709d1025dadfc52e903e43981c1644bd8bd
  - >-
    Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 <
    0b605e8ce60698c27a26f512968a597fd620d2e8
  - >-
    Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 <
    feb4bcfd405282de60aba321f13a1272b30c5af4
  - >-
    Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 <
    272dac57caa981718e7188c80c703e7bb1998054
  - >-
    Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 <
    56f7db581ee73af53cd512e00a6261a025bf1d58
  - Linux 4.9
published: '2026-05-27'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:40:54.404Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-45877'
references:
  - url: 'https://git.kernel.org/stable/c/cde7f709d1025dadfc52e903e43981c1644bd8bd'
  - url: 'https://git.kernel.org/stable/c/0b605e8ce60698c27a26f512968a597fd620d2e8'
  - url: 'https://git.kernel.org/stable/c/feb4bcfd405282de60aba321f13a1272b30c5af4'
  - url: 'https://git.kernel.org/stable/c/272dac57caa981718e7188c80c703e7bb1998054'
  - url: 'https://git.kernel.org/stable/c/56f7db581ee73af53cd512e00a6261a025bf1d58'
tags:
  - cve.org
epss: 0.00162
epssPercentile: 0.04995
ingestedAt: '2026-10-21T12:48:53.636Z'
---

## Overview

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

HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients

During a warm reset flow, the cl->device pointer may be NULL if the
reset occurs while clients are still being enumerated. Accessing
cl->device->reference_count without a NULL check leads to a kernel panic.

This issue was identified during multi-unit warm reboot stress clycles.
Add a defensive NULL check for cl->device to ensure stability under
such intensive testing conditions.

KASAN: null-ptr-deref in range [0000000000000000-0000000000000007]
Workqueue: ish_fw_update_wq fw_reset_work_fn

Call Trace:
 ishtp_bus_remove_all_clients+0xbe/0x130 [intel_ishtp]
 ishtp_reset_handler+0x85/0x1a0 [intel_ishtp]
 fw_reset_work_fn+0x8a/0xc0 [intel_ish_ipc]

## Affected

- `Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 < cde7f709d1025dadfc52e903e43981c1644bd8bd`
- `Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 < 0b605e8ce60698c27a26f512968a597fd620d2e8`
- `Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 < feb4bcfd405282de60aba321f13a1272b30c5af4`
- `Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 < 272dac57caa981718e7188c80c703e7bb1998054`
- `Linux >= 3703f53b99e4a7c373ce3568dd3f91f175ebb626 < 56f7db581ee73af53cd512e00a6261a025bf1d58`
- `Linux 4.9`

## Remediation

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