Vulnerability-Lookup

CVE-2026-101309 (GCVE-0-2026-101309)

Vulnerability from cvelistv5 – Published: 2026-10-15 07:17 – Updated: 2026-10-15 15:47

Title

Multiple vulnerabilities in bhyve device models

Summary

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.

Severity

7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 15:47 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

freebsd CNA under the mitre root

CNA scorecard D 60/100 over 69 records in the last 180 days details

References

1 reference

URL	Tags
https://security.freebsd.org/advisories/FreeBSD-S…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
FreeBSD	FreeBSD	Affected: 15.1-RELEASE , < p5 (release) Affected: 14.5-RELEASE , < p2 (release) Affected: 14.4-RELEASE , < p11 (release)	guessed

Date Public

2026-10-14 18:45

Credits

Brian Delgado from Intel using Anthropic Opus 4.8 Joshua Rogers of AISLE Research Team Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-101309

Vulnerability from fkie_nvd - Published: 2026-10-15 08:16 - Updated: 2026-10-15 16:17

Severity

7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	secteam@freebsd.org	https://security.freebsd.org/advisories/FreeBSD-SA-26:72.bhyve.asc

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "bhyve"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p5",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p2",
              "status": "affected",
              "version": "14.5-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p11",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "source": "secteam@freebsd.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\n\nA malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve\u0027s Capsicum sandbox."
    }
  ],
  "id": "CVE-2026-101309",
  "lastModified": "2026-10-15T16:17:41.437",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
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GHSA-6JF6-R4G2-3VH5

Vulnerability from github – Published: 2026-10-15 09:30 – Updated: 2026-10-15 18:32

Details

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.

Severity

7.0 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-101309"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-15T08:16:36Z",
    "severity": "HIGH"
  },
  "details": "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.\n\nA malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve\u0027s Capsicum sandbox.",
  "id": "GHSA-6jf6-r4g2-3vh5",
  "modified": "2026-10-15T18:32:27Z",
  "published": "2026-10-15T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101309"
    },
    {
      "type": "WEB",
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:72.bhyve.asc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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CVE-2026-101309 (GCVE-0-2026-101309)

FKIE_CVE-2026-101309

GHSA-6JF6-R4G2-3VH5

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Nomenclature

Vulnerability timeline

Related by attack behaviour