---
id: CVE-2026-68434
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR
  platforms


  Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected

  platforms") replace…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR
  platforms


  Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected

  platforms") replace…
severity: none
published: '2026-08-12'
updated: '2026-08-23'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68434'
references:
  - url: 'https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00177
epssPercentile: 0.07528
ingestedAt: '2026-08-23T13:48:07.254Z'
---

## Overview

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

serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected
platforms") replaced the dnv_board setup and exit callbacks with
PTR_IF(false, ...), which evaluates to NULL. However, the three call
sites in mid8250_probe() and mid8250_remove() unconditionally
dereference these function pointers without NULL checks, causing a NULL
pointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon
D (ICX-D/CDF), or Snowridge (SNR) platform.

Fix this by adding the missing NULL checks before calling the setup and
exit callbacks.

## Remediation

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