Vulnerability-Lookup

CNVD-2026-37848

Vulnerability from cnvd - Published: 2026-09-15

Title

free5GC代码问题漏洞

Description

free5GC是一个‌开源的5G核心网项目‌，由Linux基金会托管，主要用来实现3GPP标准里定义的5G核心网络功能。 free5GC存在代码问题漏洞，该漏洞源于UDR nudr-dr DELETE amf-subscriptions处理程序未能正确处理缺失的订阅数据条目，在设置404状态码后继续解引用同一缺失条目，攻击者可利用该漏洞通过已认证请求触发panic，导致服务不稳定。

Severity

中

Patch Name

free5GC代码问题漏洞的补丁

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://free5gc.org/

Reference

https://github.com/free5gc/free5gc/security/advisories/GHSA-4rqf-grm6-vf75

Impacted products

Name
free5GC free5GC <4.2.2

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-44323",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-44323"
    }
  },
  "description": "free5GC\u662f\u4e00\u4e2a\u200c\u5f00\u6e90\u76845G\u6838\u5fc3\u7f51\u9879\u76ee\u200c\uff0c\u7531Linux\u57fa\u91d1\u4f1a\u6258\u7ba1\uff0c\u4e3b\u8981\u7528\u6765\u5b9e\u73b03GPP\u6807\u51c6\u91cc\u5b9a\u4e49\u76845G\u6838\u5fc3\u7f51\u7edc\u529f\u80fd\u3002\n\nfree5GC\u5b58\u5728\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eUDR nudr-dr DELETE amf-subscriptions\u5904\u7406\u7a0b\u5e8f\u672a\u80fd\u6b63\u786e\u5904\u7406\u7f3a\u5931\u7684\u8ba2\u9605\u6570\u636e\u6761\u76ee\uff0c\u5728\u8bbe\u7f6e404\u72b6\u6001\u7801\u540e\u7ee7\u7eed\u89e3\u5f15\u7528\u540c\u4e00\u7f3a\u5931\u6761\u76ee\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u5df2\u8ba4\u8bc1\u8bf7\u6c42\u89e6\u53d1panic\uff0c\u5bfc\u81f4\u670d\u52a1\u4e0d\u7a33\u5b9a\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://free5gc.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-37848",
  "openTime": "2026-09-15",
  "patchDescription": "free5GC\u662f\u4e00\u4e2a\u200c\u5f00\u6e90\u76845G\u6838\u5fc3\u7f51\u9879\u76ee\u200c\uff0c\u7531Linux\u57fa\u91d1\u4f1a\u6258\u7ba1\uff0c\u4e3b\u8981\u7528\u6765\u5b9e\u73b03GPP\u6807\u51c6\u91cc\u5b9a\u4e49\u76845G\u6838\u5fc3\u7f51\u7edc\u529f\u80fd\u3002\r\n\r\nfree5GC\u5b58\u5728\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eUDR nudr-dr DELETE amf-subscriptions\u5904\u7406\u7a0b\u5e8f\u672a\u80fd\u6b63\u786e\u5904\u7406\u7f3a\u5931\u7684\u8ba2\u9605\u6570\u636e\u6761\u76ee\uff0c\u5728\u8bbe\u7f6e404\u72b6\u6001\u7801\u540e\u7ee7\u7eed\u89e3\u5f15\u7528\u540c\u4e00\u7f3a\u5931\u6761\u76ee\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u5df2\u8ba4\u8bc1\u8bf7\u6c42\u89e6\u53d1panic\uff0c\u5bfc\u81f4\u670d\u52a1\u4e0d\u7a33\u5b9a\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": "free5GC\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "free5GC free5GC \u003c4.2.2"
  },
  "referenceLink": "https://github.com/free5gc/free5gc/security/advisories/GHSA-4rqf-grm6-vf75",
  "serverity": "\u4e2d",
  "submitTime": "2026-05-28",
  "title": "free5GC\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e"
}

CVE-2026-44323 (GCVE-0-2026-44323)

Vulnerability from cvelistv5 – Published: 2026-05-27 15:45 – Updated: 2026-06-01 17:08

Title

free5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing subsId when UE state exists (nil pointer dereference)

Summary

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's UDR nudr-dr DELETE /subscription-data/{ueId}/{servingPlmnId}/ee-subscriptions/{subsId}/amf-subscriptions handler contains a nil-pointer dereference reachable from a single authenticated request, after one preparatory authenticated EE-subscription create. The handler checks _, ok = UESubsData.EeSubscriptionCollection[subsId] and sets a 404 problem-details on the miss path, but then continues to UESubsData.EeSubscriptionCollection[subsId].AmfSubscriptionInfos -- dereferencing the same missing entry instead of returning. Gin recovery converts the panic into HTTP 500, but the endpoint remains repeatedly panicable. This vulnerability is fixed in 4.2.2.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-01 17:04 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/free5gc/free5gc/security/advis…	x_refsource_CONFIRM
https://github.com/free5gc/free5gc/issues/919	x_refsource_MISC
https://github.com/free5gc/udr/pull/60	x_refsource_MISC
https://github.com/free5gc/udr/commit/8a1d3c63be9…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
free5gc	free5gc	Affected: < 4.2.2

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44323",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-01T17:04:56.772232Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-01T17:08:45.474Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "free5gc",
          "vendor": "free5gc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.2.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC\u0027s UDR nudr-dr DELETE /subscription-data/{ueId}/{servingPlmnId}/ee-subscriptions/{subsId}/amf-subscriptions handler contains a nil-pointer dereference reachable from a single authenticated request, after one preparatory authenticated EE-subscription create. The handler checks _, ok = UESubsData.EeSubscriptionCollection[subsId] and sets a 404 problem-details on the miss path, but then continues to UESubsData.EeSubscriptionCollection[subsId].AmfSubscriptionInfos -- dereferencing the same missing entry instead of returning. Gin recovery converts the panic into HTTP 500, but the endpoint remains repeatedly panicable. This vulnerability is fixed in 4.2.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T15:45:14.218Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-4rqf-grm6-vf75",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-4rqf-grm6-vf75"
        },
        {
          "name": "https://github.com/free5gc/free5gc/issues/919",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/free5gc/issues/919"
        },
        {
          "name": "https://github.com/free5gc/udr/pull/60",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/udr/pull/60"
        },
        {
          "name": "https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99"
        }
      ],
      "source": {
        "advisory": "GHSA-4rqf-grm6-vf75",
        "discovery": "UNKNOWN"
      },
      "title": "free5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing subsId when UE state exists (nil pointer dereference)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44323",
    "datePublished": "2026-05-27T15:45:14.218Z",
    "dateReserved": "2026-05-05T19:00:06.022Z",
    "dateUpdated": "2026-06-01T17:08:45.474Z",
    "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.
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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.

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.
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CNVD-2026-37848

CVE-2026-44323 (GCVE-0-2026-44323)

Tags

Sightings

Nomenclature

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