Vulnerability-Lookup

CNVD-2026-40689

Vulnerability from cnvd - Published: 2026-10-15

Title

FreeBSD访问控制漏洞（CNVD-2026-406890

Description

FreeBSD是一款类Unix操作系统。 FreeBSD存在访问控制漏洞，该漏洞源于在execve(2)系统调用中，辅助向量构建时P_SUGID进程标志尚未设置，导致AT_SECURE错误地为set-user-ID和set-group-ID可执行文件设置为零，攻击者可利用该漏洞通过LD_PRELOAD向这些可执行文件注入共享库，获取该二进制文件的权限。

Severity

中

Patch Name

FreeBSD访问控制漏洞（CNVD-2026-406890的补丁

Patch Description

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://security.freebsd.org/advisories/FreeBSD-SA-26:30.linux.asc

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-49413

Impacted products

Name
['FreeBSD FreeBSD <15.0-RELEASE p10', 'FreeBSD FreeBSD <14.4-RELEASE p6', 'FreeBSD FreeBSD <14.3-RELEASE p15']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-49413",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-49413"
    }
  },
  "description": "FreeBSD\u662f\u4e00\u6b3e\u7c7bUnix\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nFreeBSD\u5b58\u5728\u8bbf\u95ee\u63a7\u5236\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728execve(2)\u7cfb\u7edf\u8c03\u7528\u4e2d\uff0c\u8f85\u52a9\u5411\u91cf\u6784\u5efa\u65f6P_SUGID\u8fdb\u7a0b\u6807\u5fd7\u5c1a\u672a\u8bbe\u7f6e\uff0c\u5bfc\u81f4AT_SECURE\u9519\u8bef\u5730\u4e3aset-user-ID\u548cset-group-ID\u53ef\u6267\u884c\u6587\u4ef6\u8bbe\u7f6e\u4e3a\u96f6\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7LD_PRELOAD\u5411\u8fd9\u4e9b\u53ef\u6267\u884c\u6587\u4ef6\u6ce8\u5165\u5171\u4eab\u5e93\uff0c\u83b7\u53d6\u8be5\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u6743\u9650\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://security.freebsd.org/advisories/FreeBSD-SA-26:30.linux.asc",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-40689",
  "openTime": "2026-10-15",
  "patchDescription": "FreeBSD\u662f\u4e00\u6b3e\u7c7bUnix\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nFreeBSD\u5b58\u5728\u8bbf\u95ee\u63a7\u5236\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728execve(2)\u7cfb\u7edf\u8c03\u7528\u4e2d\uff0c\u8f85\u52a9\u5411\u91cf\u6784\u5efa\u65f6P_SUGID\u8fdb\u7a0b\u6807\u5fd7\u5c1a\u672a\u8bbe\u7f6e\uff0c\u5bfc\u81f4AT_SECURE\u9519\u8bef\u5730\u4e3aset-user-ID\u548cset-group-ID\u53ef\u6267\u884c\u6587\u4ef6\u8bbe\u7f6e\u4e3a\u96f6\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7LD_PRELOAD\u5411\u8fd9\u4e9b\u53ef\u6267\u884c\u6587\u4ef6\u6ce8\u5165\u5171\u4eab\u5e93\uff0c\u83b7\u53d6\u8be5\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u6743\u9650\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\u8bbf\u95ee\u63a7\u5236\u6f0f\u6d1e\uff08CNVD-2026-406890\u7684\u8865\u4e01",
  "products": {
    "product": [
      "FreeBSD FreeBSD \u003c15.0-RELEASE p10",
      "FreeBSD FreeBSD \u003c14.4-RELEASE p6",
      "FreeBSD FreeBSD \u003c14.3-RELEASE p15"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-49413",
  "serverity": "\u4e2d",
  "submitTime": "2026-07-08",
  "title": "FreeBSD\u8bbf\u95ee\u63a7\u5236\u6f0f\u6d1e\uff08CNVD-2026-406890"
}

CVE-2026-49413 (GCVE-0-2026-49413)

Vulnerability from cvelistv5 – Published: 2026-06-27 09:08 – Updated: 2026-06-29 13:05

Title

Flaw in Linuxulator execution of setugid binaries

Summary

The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag. During execve(2), this flag is not yet set at the point where the auxiliary vector is constructed, so AT_SECURE was incorrectly set to zero for set-user-ID and set-group-ID executables. An unprivileged local user can inject a shared library via LD_PRELOAD into a set-user-ID or set-group-ID Linux binary, gaining the privileges of that binary.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-29 13:05 UTC

CWE

CWE-266 - Incorrect Privilege Assignment

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 , < p10 (release) Affected: 14.4-RELEASE , < p6 (release) Affected: 14.3-RELEASE , < p15 (release)

Date Public

2026-06-09 23:30

Credits

Minseong Kim of NSHC Red Alert Labs

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.1,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-49413",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-29T13:05:31.678040Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-29T13:05:38.668Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "linux"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p10",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p6",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p15",
              "status": "affected",
              "version": "14.3-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Minseong Kim of NSHC Red Alert Labs"
        }
      ],
      "datePublic": "2026-06-09T23:30:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag.  During execve(2), this flag is not yet set at the point where the auxiliary vector is constructed, so AT_SECURE was incorrectly set to zero for set-user-ID and set-group-ID executables.\n\nAn unprivileged local user can inject a shared library via LD_PRELOAD into a set-user-ID or set-group-ID Linux binary, gaining the privileges of that binary."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-266",
              "description": "CWE-266: Incorrect Privilege Assignment",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-27T09:08:23.756Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:30.linux.asc"
        }
      ],
      "title": "Flaw in Linuxulator execution of setugid binaries",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-49413",
    "datePublished": "2026-06-27T09:08:23.756Z",
    "dateReserved": "2026-05-29T20:24:28.615Z",
    "dateUpdated": "2026-06-29T13:05:38.668Z",
    "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.

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.

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