Vulnerability-Lookup

CNVD-2025-03432

Vulnerability from cnvd - Published: 2025-02-21

Title

Linux kernel vsock_bpf_recvmsg函数拒绝服务漏洞

Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在拒绝服务漏洞，该漏洞源于vsock_bpf_recvmsg函数在未分配传输层时未正确检查vsk->transport，攻击者可利用该漏洞导致在尝试接收数据时可能访问空指针，引发内核崩溃。

Severity

中

Patch Name

Linux kernel vsock_bpf_recvmsg函数拒绝服务漏洞的补丁

Patch Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在拒绝服务漏洞，该漏洞源于vsock_bpf_recvmsg函数在未分配传输层时未正确检查vsk->transport，攻击者可利用该漏洞导致在尝试接收数据时可能访问空指针，引发内核崩溃。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

厂商已发布了漏洞修复程序，请及时关注更新： https://git.kernel.org/stable/c/58e586c30d0b6f5dc0174a41026f2b0a48c9aab6

Reference

https://nvd.nist.gov/vuln/detail/CVE-2025-21670

Impacted products

Name
Linux Kernel

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2025-21670",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2025-21670"
    }
  },
  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\n\nLinux kernel\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8evsock_bpf_recvmsg\u51fd\u6570\u5728\u672a\u5206\u914d\u4f20\u8f93\u5c42\u65f6\u672a\u6b63\u786e\u68c0\u67e5vsk-\u003etransport\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5728\u5c1d\u8bd5\u63a5\u6536\u6570\u636e\u65f6\u53ef\u80fd\u8bbf\u95ee\u7a7a\u6307\u9488\uff0c\u5f15\u53d1\u5185\u6838\u5d29\u6e83\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://git.kernel.org/stable/c/58e586c30d0b6f5dc0174a41026f2b0a48c9aab6",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2025-03432",
  "openTime": "2025-02-21",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux kernel\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8evsock_bpf_recvmsg\u51fd\u6570\u5728\u672a\u5206\u914d\u4f20\u8f93\u5c42\u65f6\u672a\u6b63\u786e\u68c0\u67e5vsk-\u003etransport\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5728\u5c1d\u8bd5\u63a5\u6536\u6570\u636e\u65f6\u53ef\u80fd\u8bbf\u95ee\u7a7a\u6307\u9488\uff0c\u5f15\u53d1\u5185\u6838\u5d29\u6e83\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": "Linux kernel vsock_bpf_recvmsg\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Kernel"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2025-21670",
  "serverity": "\u4e2d",
  "submitTime": "2025-02-17",
  "title": "Linux kernel vsock_bpf_recvmsg\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e"
}

CVE-2025-21670 (GCVE-0-2025-21670)

Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-05-11 21:04

Title

vsock/bpf: return early if transport is not assigned

Summary

In the Linux kernel, the following vulnerability has been resolved: vsock/bpf: return early if transport is not assigned Some of the core functions can only be called if the transport has been assigned. As Michal reported, a socket might have the transport at NULL, for example after a failed connect(), causing the following trace: BUG: kernel NULL pointer dereference, address: 00000000000000a0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 12faf8067 P4D 12faf8067 PUD 113670067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 15 UID: 0 PID: 1198 Comm: a.out Not tainted 6.13.0-rc2+ RIP: 0010:vsock_connectible_has_data+0x1f/0x40 Call Trace: vsock_bpf_recvmsg+0xca/0x5e0 sock_recvmsg+0xb9/0xc0 __sys_recvfrom+0xb3/0x130 __x64_sys_recvfrom+0x20/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e So we need to check the `vsk->transport` in vsock_bpf_recvmsg(), especially for connected sockets (stream/seqpacket) as we already do in __vsock_connectible_recvmsg().

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:52 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/58e586c30d0b6f5dc…
https://git.kernel.org/stable/c/6771e1279dadf1d92…
https://git.kernel.org/stable/c/f6abafcd32f9cfc4b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 634f1a7110b439c65fd8a809171c1d2d28bcea6f , < 58e586c30d0b6f5dc0174a41026f2b0a48c9aab6 (git) Affected: 634f1a7110b439c65fd8a809171c1d2d28bcea6f , < 6771e1279dadf1d92a72e1465134257d9e6f2459 (git) Affected: 634f1a7110b439c65fd8a809171c1d2d28bcea6f , < f6abafcd32f9cfc4b1a2f820ecea70773e26d423 (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.74 , ≤ 6.6.* (semver) Unaffected: 6.12.11 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-21670",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:52:14.755267Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-476",
                "description": "CWE-476 NULL Pointer Dereference",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:57:12.316Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/vsock_bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "58e586c30d0b6f5dc0174a41026f2b0a48c9aab6",
              "status": "affected",
              "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f",
              "versionType": "git"
            },
            {
              "lessThan": "6771e1279dadf1d92a72e1465134257d9e6f2459",
              "status": "affected",
              "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f",
              "versionType": "git"
            },
            {
              "lessThan": "f6abafcd32f9cfc4b1a2f820ecea70773e26d423",
              "status": "affected",
              "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/vsock_bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.74",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.74",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.11",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/bpf: return early if transport is not assigned\n\nSome of the core functions can only be called if the transport\nhas been assigned.\n\nAs Michal reported, a socket might have the transport at NULL,\nfor example after a failed connect(), causing the following trace:\n\n    BUG: kernel NULL pointer dereference, address: 00000000000000a0\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    PGD 12faf8067 P4D 12faf8067 PUD 113670067 PMD 0\n    Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n    CPU: 15 UID: 0 PID: 1198 Comm: a.out Not tainted 6.13.0-rc2+\n    RIP: 0010:vsock_connectible_has_data+0x1f/0x40\n    Call Trace:\n     vsock_bpf_recvmsg+0xca/0x5e0\n     sock_recvmsg+0xb9/0xc0\n     __sys_recvfrom+0xb3/0x130\n     __x64_sys_recvfrom+0x20/0x30\n     do_syscall_64+0x93/0x180\n     entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nSo we need to check the `vsk-\u003etransport` in vsock_bpf_recvmsg(),\nespecially for connected sockets (stream/seqpacket) as we already\ndo in __vsock_connectible_recvmsg()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:04:10.374Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/58e586c30d0b6f5dc0174a41026f2b0a48c9aab6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6771e1279dadf1d92a72e1465134257d9e6f2459"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6abafcd32f9cfc4b1a2f820ecea70773e26d423"
        }
      ],
      "title": "vsock/bpf: return early if transport is not assigned",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21670",
    "datePublished": "2025-01-31T11:25:33.874Z",
    "dateReserved": "2024-12-29T08:45:45.735Z",
    "dateUpdated": "2026-05-11T21:04:10.374Z",
    "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.

Detection rules are retrieved from Rulezet.

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

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.