CVE-2026-101311
FreeBSD: Multiple vulnerabilities in bhyve device models
FreeBSD FreeBSDOperating systems
CVSS
7.0HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.12%Chance of exploitation activity in the next 30 days, higher than 1% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 3
- FreeBSDaffected: 15.1-RELEASE before p5CVE List
- FreeBSDaffected: 14.5-RELEASE before p2CVE List
- FreeBSDaffected: 14.4-RELEASE before p11CVE List