---
id: CVE-2026-74617
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dibs: initialise dibs->lock in dibs_dev_alloc()

  dibs->lock is initialised by dibs_dev_add(), but a dibs device can
  already take interrupts before that call: ism_probe(…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dibs: initialise dibs->lock in dibs_dev_alloc()

  dibs->lock is initialised by dibs_dev_add(), but a dibs device can
  already take interrupts before that call: ism_probe(…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
published: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74617'
references:
  - url: 'https://git.kernel.org/stable/c/2926031acba100d0c18fcfaa7a2ed29609318848'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c27e360545373b7aee9862a5beef3b9fb3df0c25'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fe79571f40434b257d68cbfb7b3ae93a794d8a11'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00649
epssPercentile: 0.49765
ingestedAt: '2026-10-14T13:30:58.517Z'
---

## Overview

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

dibs: initialise dibs->lock in dibs_dev_alloc()

dibs->lock is initialised by dibs_dev_add(), but a dibs device can
already take interrupts before that call: ism_probe() runs
ism_dev_init(), and hence request_irq(), before it calls
dibs_dev_add(). No client can have registered a dmb at that point, so
no dmb interrupt can occur, but a GID event interrupt can, and
ism_handle_irq() takes dibs->lock unconditionally on entry, before it
inspects anything else.

Initialise the lock in dibs_dev_alloc() instead, so that it is valid as
soon as a driver can publish the device to its interrupt handler.

## Remediation

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