---
id: CVE-2026-89806
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation

  The framebuffer size calculation `fb_size = linebytes * height` can
  overflow when both values are large (…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation

  The framebuffer size calculation `fb_size = linebytes * height` can
  overflow when both values are large (…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 <
    ded6ad826fe0fd059333d3a3b3e1742c8e45ff41
  - >-
    Linux >= c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 <
    d9daf9a6e7a6f82ef338a09386eefc6807100d3f
  - >-
    Linux >= c8a17756c42581ba1a567d1dd3b69e8f5619a7d8 <
    c6f48e59ece0123f6a11527ad4d89b21c2d65b87
  - Linux 6.2
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:10.350'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89806'
references:
  - url: 'https://git.kernel.org/stable/c/c6f48e59ece0123f6a11527ad4d89b21c2d65b87'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d9daf9a6e7a6f82ef338a09386eefc6807100d3f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ded6ad826fe0fd059333d3a3b3e1742c8e45ff41'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.005Z'
epss: 0.00194
epssPercentile: 0.07986
---

## Overview

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

drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation

The framebuffer size calculation `fb_size = linebytes * height` can
overflow when both values are large (e.g., 46341 * 46341 > INT_MAX).
Since linebytes and height are both int types, the multiplication is
performed as int * int, which results in undefined behavior on overflow.

Use check_mul_overflow() to detect and prevent this overflow, consistent
with the approach used in simpledrm.c and corebootdrm.c.

## Remediation

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