Vulnerability-Lookup

CNVD-2026-40697

Vulnerability from cnvd - Published: 2026-10-15

Title

FreeBSD存在未明漏洞

Description

FreeBSD是一套类Unix操作系统。 FreeBSD存在存在未明漏洞，该漏洞源于cap_net服务在处理旧限制中的键被新限制省略时，未能正确处理缺失键，将其视为“允许任意”而非拒绝，攻击者可利用该漏洞导致未授权操作。

Severity

中

Patch Name

FreeBSD存在未明漏洞的补丁

Patch Description

FreeBSD是一套类Unix操作系统。 FreeBSD存在存在未明漏洞，该漏洞源于cap_net服务在处理旧限制中的键被新限制省略时，未能正确处理缺失键，将其视为“允许任意”而非拒绝，攻击者可利用该漏洞导致未授权操作。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级程序修复该安全问题，详情见厂商官网: https://www.freebsd.org/

Reference

https://security.freebsd.org/advisories/FreeBSD-SA-26:24.cap_net.asc

Impacted products

Name
['FreeBSD FreeBSD <15.0-RELEASE p9', 'FreeBSD FreeBSD <14.4-RELEASE p5', 'FreeBSD FreeBSD <14.3-RELEASE p14']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-45254",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-45254"
    }
  },
  "description": "FreeBSD\u662f\u4e00\u5957\u7c7bUnix\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nFreeBSD\u5b58\u5728\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8ecap_net\u670d\u52a1\u5728\u5904\u7406\u65e7\u9650\u5236\u4e2d\u7684\u952e\u88ab\u65b0\u9650\u5236\u7701\u7565\u65f6\uff0c\u672a\u80fd\u6b63\u786e\u5904\u7406\u7f3a\u5931\u952e\uff0c\u5c06\u5176\u89c6\u4e3a\u201c\u5141\u8bb8\u4efb\u610f\u201d\u800c\u975e\u62d2\u7edd\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u672a\u6388\u6743\u64cd\u4f5c\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u7a0b\u5e8f\u4fee\u590d\u8be5\u5b89\u5168\u95ee\u9898\uff0c\u8be6\u60c5\u89c1\u5382\u5546\u5b98\u7f51:\r\nhttps://www.freebsd.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-40697",
  "openTime": "2026-10-15",
  "patchDescription": "FreeBSD\u662f\u4e00\u5957\u7c7bUnix\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nFreeBSD\u5b58\u5728\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8ecap_net\u670d\u52a1\u5728\u5904\u7406\u65e7\u9650\u5236\u4e2d\u7684\u952e\u88ab\u65b0\u9650\u5236\u7701\u7565\u65f6\uff0c\u672a\u80fd\u6b63\u786e\u5904\u7406\u7f3a\u5931\u952e\uff0c\u5c06\u5176\u89c6\u4e3a\u201c\u5141\u8bb8\u4efb\u610f\u201d\u800c\u975e\u62d2\u7edd\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u672a\u6388\u6743\u64cd\u4f5c\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "FreeBSD\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
      "FreeBSD FreeBSD \u003c15.0-RELEASE p9",
      "FreeBSD FreeBSD \u003c14.4-RELEASE p5",
      "FreeBSD FreeBSD \u003c14.3-RELEASE p14"
    ]
  },
  "referenceLink": "https://security.freebsd.org/advisories/FreeBSD-SA-26:24.cap_net.asc",
  "serverity": "\u4e2d",
  "submitTime": "2026-05-22",
  "title": "FreeBSD\u5b58\u5728\u672a\u660e\u6f0f\u6d1e"
}

CVE-2026-45254 (GCVE-0-2026-45254)

Vulnerability from cvelistv5 – Published: 2026-05-21 09:34 – Updated: 2026-05-21 14:37

Title

Incorrect libcap_net limitation list manipulation

Summary

In the case of the cap_net service, when a key present in the old limit was omitted from the new limit, the missing key was treated as "allow any" instead of being rejected. In certain scenarios, an application that had previously restricted a subset of network operations could ask for a new limit that extended the permissions of the process.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-21 14:35 UTC

CWE

CWE-269 - Improper Privilege Management

Assigner

freebsd CNA under the mitre root

CNA scorecard D 60/100 over 67 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
FreeBSD	FreeBSD	Affected: 15.0-RELEASE , < p9 (release) Affected: 14.4-RELEASE , < p5 (release) Affected: 14.3-RELEASE , < p14 (release)

Date Public

2026-05-20 23:00

Credits

Joshua Rogers of AISLE Research Team

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-45254",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-21T14:35:55.800907Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-21T14:37:03.795Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "libcap_net"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p9",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p5",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p14",
              "status": "affected",
              "version": "14.3-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Joshua Rogers of AISLE Research Team"
        }
      ],
      "datePublic": "2026-05-20T23:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "In the case of the cap_net service, when a key present in the old limit was omitted from the new limit, the missing key was treated as \"allow any\" instead of being rejected.\n\nIn certain scenarios, an application that had previously restricted a subset of network operations could ask for a new limit that extended the permissions of the process."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-269",
              "description": "CWE-269 Improper Privilege Management",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-21T09:34:37.541Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:24.cap_net.asc"
        }
      ],
      "title": "Incorrect libcap_net limitation list manipulation",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-45254",
    "datePublished": "2026-05-21T09:34:37.541Z",
    "dateReserved": "2026-05-11T16:27:44.891Z",
    "dateUpdated": "2026-05-21T14:37:03.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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