CVE-2026-101309

Multiple vulnerabilities in bhyve device models

CVSS score

7.0

EPSS probability

%0.2

Risk score

0.0

Published

11 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

Vulnerability in bhyve Device Models for CVE-2026-101309

Sources read

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

CVE-2026-101309 is a race condition vulnerability in the bhyve xHCI device model stemming from guest memory handling [S0]. This flaw allows malicious guests to crash the bhyve process or potentially execute arbitrary code in the host userspace context [S0].

Why does it matter?

This vulnerability matters because it poses a risk of escaping the virtual machine boundary into the host userspace context and compromising bhyve process integrity [S0].

What should be done?

Follow vendor security advisories [S0]
Review the relevant FreeBSD advisory document [S0]

Chain of evidence and sources2 verified claims

CVE-2026-101309 zafiyeti, xHCI aygıt modelindeki yarış koşulundan kaynaklanmaktadır.

S0 · daybreach-canonical

Açık, konuk sistemde çalışan kötü amaçlı ve ayrıcalıklı kodlar aracılığıyla tetiklenebilir.

S0 · daybreach-canonical

Show the technical text from the sources

The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest. The size was re-read from guest memory on each use, and Transfer Request Block (TRB) fields were loaded without protection against concurrent modification by the guest. This race condition could be triggered by a guest running malicious, privileged code. 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.

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

CWE: CWE-362

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-101309 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	freebsd	freebsd	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
7.0	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD
7.0	CVSS V3_1	HIGH	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	CVE ADP

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

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Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-101309 is associated with the following CWEs:

CWE-362: Common Weakness Enumeration Entry CWE-362

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-101309 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsLow

UserGerekmiyor

Official Sources and Advisories

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

CVSS Vector Radar Chart

7.0 / 10

Vulnerability Scoring Details

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

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow privileges

User InteractionNone required

Confidentiality (Gizlilik)High

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

freebsd

Weakness Type (CWE & CAPEC)

CWE-362

Similar Vulnerabilities

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