---
id: CVE-2026-101311
title: >-
  The framebuffer device model's maximum resolution constants were duplicated
  between the framebuffer and RFB modules and had gotten out of sync
summary: >-
  The framebuffer device model's maximum resolution constants were duplicated
  between the framebuffer and RFB modules and had gotten out of sync. 
  Additionally, writes to the framebuffer BAR could set arbitrary width and
  height values with…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-362
vendor: FreeBSD
product: FreeBSD
affected:
  - FreeBSD >= 15.1-RELEASE < p5
  - FreeBSD >= 14.5-RELEASE < p2
  - FreeBSD >= 14.4-RELEASE < p11
published: '2026-10-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T04:18:11.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101311'
references:
  - url: 'https://security.freebsd.org/advisories/FreeBSD-SA-26:72.bhyve.asc'
    label: secteam@freebsd.org
tags:
  - nvd
  - cve.org
epss: 0.00117
epssPercentile: 0.01669
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T13:39:46.092325Z'
ingestedAt: '2026-10-15T07:57:27.856Z'
---

## Overview

The framebuffer device model's maximum resolution constants were duplicated between the framebuffer and RFB modules and had gotten out of sync.  Additionally, writes to the framebuffer BAR could set arbitrary width and height values without validation, and the framebuffer BAR I/O and RFB rendering threads were not synchronized.

A malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.

## Remediation

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