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CNVD-2025-03434

Vulnerability from cnvd - Published: 2025-02-21

Title

Linux kernel缓冲区溢出漏洞（CNVD-2025-03434）

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存在缓冲区溢出漏洞，该漏洞源于pktgen的get_imix_entries函数中对imix_entries数组的边界检查错误，攻击者可利用该漏洞导致在传递大量条目时访问数组越界，可能引发系统崩溃。

Severity

中

Patch Name

Linux kernel缓冲区溢出漏洞（CNVD-2025-03434）的补丁

Patch Description

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/1a9b65c672ca9dc4ba52ca2fd54329db9580ce29

Reference

https://nvd.nist.gov/vuln/detail/CVE-2025-21680

Impacted products

Name
Linux Kernel

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2025-21680",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2025-21680"
    }
  },
  "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\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8epktgen\u7684get_imix_entries\u51fd\u6570\u4e2d\u5bf9imix_entries\u6570\u7ec4\u7684\u8fb9\u754c\u68c0\u67e5\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5728\u4f20\u9012\u5927\u91cf\u6761\u76ee\u65f6\u8bbf\u95ee\u6570\u7ec4\u8d8a\u754c\uff0c\u53ef\u80fd\u5f15\u53d1\u7cfb\u7edf\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/1a9b65c672ca9dc4ba52ca2fd54329db9580ce29",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2025-03434",
  "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\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8epktgen\u7684get_imix_entries\u51fd\u6570\u4e2d\u5bf9imix_entries\u6570\u7ec4\u7684\u8fb9\u754c\u68c0\u67e5\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u5728\u4f20\u9012\u5927\u91cf\u6761\u76ee\u65f6\u8bbf\u95ee\u6570\u7ec4\u8d8a\u754c\uff0c\u53ef\u80fd\u5f15\u53d1\u7cfb\u7edf\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\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2025-03434\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Kernel"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2025-21680",
  "serverity": "\u4e2d",
  "submitTime": "2025-02-17",
  "title": "Linux kernel\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2025-03434\uff09"
}

CVE-2025-21680 (GCVE-0-2025-21680)

Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-08-05 11:53

Title

pktgen: Avoid out-of-bounds access in get_imix_entries

Summary

In the Linux kernel, the following vulnerability has been resolved: pktgen: Avoid out-of-bounds access in get_imix_entries Passing a sufficient amount of imix entries leads to invalid access to the pkt_dev->imix_entries array because of the incorrect boundary check. UBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24 index 20 is out of range for type 'imix_pkt [20]' CPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: <TASK> dump_stack_lvl lib/dump_stack.c:117 __ubsan_handle_out_of_bounds lib/ubsan.c:429 get_imix_entries net/core/pktgen.c:874 pktgen_if_write net/core/pktgen.c:1063 pde_write fs/proc/inode.c:334 proc_reg_write fs/proc/inode.c:346 vfs_write fs/read_write.c:593 ksys_write fs/read_write.c:644 do_syscall_64 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130 Found by Linux Verification Center (linuxtesting.org) with SVACE. [ fp: allow to fill the array completely; minor changelog cleanup ]

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/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 2025-10-01 19:51 UTC

CWE

CWE-129 - Improper Validation of Array Index

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/3450092cc2d1c311c…
https://git.kernel.org/stable/c/e5d24a7074dcd0c7e…
https://git.kernel.org/stable/c/7cde21f52042aa2e2…
https://git.kernel.org/stable/c/1a9b65c672ca9dc4b…
https://git.kernel.org/stable/c/76201b5979768500b…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 52a62f8603f97e720882c8f5aff2767ac6a11d5f , < 3450092cc2d1c311c5ea92a2486daa2a33520ea5 (git) Affected: 52a62f8603f97e720882c8f5aff2767ac6a11d5f , < e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486 (git) Affected: 52a62f8603f97e720882c8f5aff2767ac6a11d5f , < 7cde21f52042aa2e29a654458166b873d2ae66b3 (git) Affected: 52a62f8603f97e720882c8f5aff2767ac6a11d5f , < 1a9b65c672ca9dc4ba52ca2fd54329db9580ce29 (git) Affected: 52a62f8603f97e720882c8f5aff2767ac6a11d5f , < 76201b5979768500bca362871db66d77cb4c225e (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.177 , ≤ 5.15.* (semver) Unaffected: 6.1.127 , ≤ 6.1.* (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": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-21680",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:51:54.428740Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-129",
                "description": "CWE-129 Improper Validation of Array Index",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:57:11.468Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:58:57.266Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/pktgen.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3450092cc2d1c311c5ea92a2486daa2a33520ea5",
              "status": "affected",
              "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f",
              "versionType": "git"
            },
            {
              "lessThan": "e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486",
              "status": "affected",
              "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f",
              "versionType": "git"
            },
            {
              "lessThan": "7cde21f52042aa2e29a654458166b873d2ae66b3",
              "status": "affected",
              "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f",
              "versionType": "git"
            },
            {
              "lessThan": "1a9b65c672ca9dc4ba52ca2fd54329db9580ce29",
              "status": "affected",
              "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f",
              "versionType": "git"
            },
            {
              "lessThan": "76201b5979768500bca362871db66d77cb4c225e",
              "status": "affected",
              "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/pktgen.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.127",
              "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": "5.15.177",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.127",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.74",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.11",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npktgen: Avoid out-of-bounds access in get_imix_entries\n\nPassing a sufficient amount of imix entries leads to invalid access to the\npkt_dev-\u003eimix_entries array because of the incorrect boundary check.\n\nUBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24\nindex 20 is out of range for type \u0027imix_pkt [20]\u0027\nCPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl lib/dump_stack.c:117\n__ubsan_handle_out_of_bounds lib/ubsan.c:429\nget_imix_entries net/core/pktgen.c:874\npktgen_if_write net/core/pktgen.c:1063\npde_write fs/proc/inode.c:334\nproc_reg_write fs/proc/inode.c:346\nvfs_write fs/read_write.c:593\nksys_write fs/read_write.c:644\ndo_syscall_64 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE.\n\n[ fp: allow to fill the array completely; minor changelog cleanup ]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable parser is reached only by write(2) to /proc/net/pktgen/\u003cifname\u003e, requiring local access to the machine. No network-facing path reaches get_imix_entries().\nAC:L - A single deterministic write() of 21 \"size,weight\" pairs triggers the out-of-bounds write every time; there is no race, timing window, or memory-layout condition outside the attacker\u0027s control.\nPR:L - pktgen_if_write() and pktgen_thread_write() contain no capable() check at all, and under `unshare -Urn` the /proc/net/pktgen entries inherit the netns owner\u0027s uid (proc_net_ns_init sets /proc/net to make_kuid(net-\u003euser_ns, 0)), so an ordinary unprivileged user owns the 0600 files in their own namespace.\nUI:N - The attacker performs the entire sequence themselves \u2014 create the namespace, add the device, write the imix string \u2014 with no action by any other user.\nS:U - The corruption is confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The overwritten imix_distribution[] bytes become the array index in mod_cur_headers(), turning the bug into an out-of-bounds read of up to ~6 KB past the pktgen_dev allocation whose contents are echoed back through cur_pkt_size in the /proc output.\nI:H - This is an out-of-bounds write of 16 fully attacker-controlled bytes past imix_entries[], and the resulting corrupted index yields a further OOB increment (entry-\u003ecount_so_far++) into neighbouring slab objects at an attacker-selected offset.\nA:H - The out-of-bounds access traps under CONFIG_UBSAN_BOUNDS/UBSAN_TRAP (and panics with panic_on_warn), and the stale n_imix_entries=21 plus corrupted distribution drives further OOB accesses and bogus cur_pkt_size values into skb allocation, causing kernel crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:53:35.511Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3450092cc2d1c311c5ea92a2486daa2a33520ea5"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486"
        },
        {
          "url": "https://git.kernel.org/stable/c/7cde21f52042aa2e29a654458166b873d2ae66b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a9b65c672ca9dc4ba52ca2fd54329db9580ce29"
        },
        {
          "url": "https://git.kernel.org/stable/c/76201b5979768500bca362871db66d77cb4c225e"
        }
      ],
      "title": "pktgen: Avoid out-of-bounds access in get_imix_entries",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21680",
    "datePublished": "2025-01-31T11:25:40.831Z",
    "dateReserved": "2024-12-29T08:45:45.738Z",
    "dateUpdated": "2026-08-05T11:53:35.511Z",
    "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.

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-2025-03434

CVE-2025-21680 (GCVE-0-2025-21680)

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Nomenclature

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