---
id: CVE-2026-74652
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ

  The RS485 trigger hrtimers are embedded in the devm-managed port and can
  fire after it is freed
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ

  The RS485 trigger hrtimers are embedded in the devm-managed port and can
  fire after it is freed. The IRQ ha…
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-2026-74652'
references:
  - url: 'https://git.kernel.org/stable/c/36672c8d7d14e9c43287528455d2c97b526ea6ad'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/759ead98a39fb625be302f9aa66290985dcaa325'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e57f0aa5c35be37218ba0e4887b241584dd4b2d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00173
epssPercentile: 0.06266
ingestedAt: '2026-10-14T13:30:58.527Z'
---

## Overview

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

serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ

The RS485 trigger hrtimers are embedded in the devm-managed port and can
fire after it is freed. The IRQ handler can arm a timer, so free the IRQ
first and then cancel both timers.

Complete the RS485 stop without arming a timer, and cancel the timers
in remove() for the suspend-then-unbind path, where shutdown is not
called.

This issue was found by an in-house static analysis tool.

## Remediation

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