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CVE-2026-101311— Multiple vulnerabilities in bhyve device models

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

帧缓冲设备模型中的最大分辨率常量在帧缓冲模块和 RFB 模块之间存在重复，并且已不同步。此外，对帧缓冲 BAR（基地址寄存器）的写入操作可以设置任意宽度和高度值，而未经过验证。同时，帧缓冲 BAR 的 I/O 操作与 RFB 渲染线程之间缺乏同步机制。 攻击者可以通过构造恶意 Guest 虚拟机，导致 bhyve 进程崩溃，或在运行虚拟机的 bhyve 用户态上下文环境中执行任意代码（具体能力受限于 bhyve 的 Capsicum 沙箱隔离机制）。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.1-RELEASE< p5 affected
14.5-RELEASE< p2 affected
14.4-RELEASE< p11 affected
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I. Basic Information for CVE-2026-101311

Vulnerability Information
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Vulnerability Title
Multiple vulnerabilities in bhyve device models
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.1-RELEASE ~ p5 -

II. Public POCs for CVE-2026-101311

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III. Intelligence Information for CVE-2026-101311

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Other References for CVE-2026-101311 (1)

Same Patch Batch · FreeBSD · 2026-10-15 · 13 CVEs total

CVE-2026-58099 Memory safety bugs in kqueue copy-on-fork implementation
CVE-2026-58098 Heap out-of-bounds access in semop(2)
CVE-2026-58100 Memory safety bugs in kqueue copy-on-fork implementation
CVE-2026-101302 Remote DoS via receive-side kernel TLS
CVE-2026-101306 Multiple jail filesystem root escapes
CVE-2026-101305 Multiple jail filesystem root escapes
CVE-2026-101304 Multiple jail filesystem root escapes
CVE-2026-101303 IPv6 UDP sendto(2) bypasses jail loopback restriction
CVE-2026-101307 Remotely triggerable buffer overflow in tcp_rack
CVE-2026-101308 TOCTOU race between sound(4) buffer resizing and mmap
CVE-2026-101309 Multiple vulnerabilities in bhyve device models
CVE-2026-101310 Multiple vulnerabilities in bhyve device models

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-362

V. Comments for CVE-2026-101311

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