---
id: CVE-2026-74687
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  watchdog: at91sam9_wdt: prevent timer rearm during teardown

  at91_ping() rearms the watchdog timer from its callback
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  watchdog: at91sam9_wdt: prevent timer rearm during teardown

  at91_ping() rearms the watchdog timer from its callback. timer_delete()
  neither waits for a running callbac…
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'
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-2026-74687'
references:
  - url: 'https://git.kernel.org/stable/c/29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b7949b0a7d998013b7ec8617a0ef5b07cca80be4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00173
epssPercentile: 0.06284
ingestedAt: '2026-10-14T13:30:58.537Z'
---

## Overview

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

watchdog: at91sam9_wdt: prevent timer rearm during teardown

at91_ping() rearms the watchdog timer from its callback. timer_delete()
neither waits for a running callback nor prevents it from rearming the
timer, so probe failure or driver removal can leave the timer accessing the
devm-allocated at91wdt after it has been freed.

Use timer_shutdown_sync() on both teardown paths. It waits for a running
callback and rejects any attempt by the callback to rearm the timer.

## Remediation

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