---
title: "CVE-2026-89806: Linux Kernel drm/sysfb ofdrm - Integer Overflow"
description: "Linux kernel drm/sysfb ofdrm contains an integer overflow caused by unchecked multiplication of linebytes and height in framebuffer size calculation, letting attackers cause undefined behavior or potential denial of service, exploit requires crafted input triggering large framebuffer sizes."
url: https://panop.io/threat-heartbeat/CVE-2026-89806/
---

# CVE-2026-89806 Linux Kernel drm/sysfb ofdrm - Integer Overflow

Linux kernel drm/sysfb ofdrm contains an integer overflow caused by unchecked multiplication of linebytes and height in framebuffer size calculation, letting attackers cause undefined behavior or potential denial of service, exploit requires crafted input triggering large framebuffer sizes.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.20% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89806)

## Details

Type

Integer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix using check\_mul\_overflow() to prevent integer overflow.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89806](https://nvd.nist.gov/vuln/detail/CVE-2026-89806)
- [https://git.kernel.org/stable/c/c6f48e59ece0123f6a11527ad4d89b21c2d65b87](https://git.kernel.org/stable/c/c6f48e59ece0123f6a11527ad4d89b21c2d65b87)
- [https://git.kernel.org/stable/c/d9daf9a6e7a6f82ef338a09386eefc6807100d3f](https://git.kernel.org/stable/c/d9daf9a6e7a6f82ef338a09386eefc6807100d3f)
- [https://git.kernel.org/stable/c/ded6ad826fe0fd059333d3a3b3e1742c8e45ff41](https://git.kernel.org/stable/c/ded6ad826fe0fd059333d3a3b3e1742c8e45ff41)
- [https://git.kernel.org/stable/c/711fe7949d37656a5586244afee9523b9e5e37e9](https://git.kernel.org/stable/c/711fe7949d37656a5586244afee9523b9e5e37e9)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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