Vulnerability-Lookup

FKIE_CVE-2021-47160

Vulnerability from fkie_nvd - Published: 2024-03-25 10:15 - Updated: 2026-08-04 10:16

Severity

8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net: dsa: mt7530: fix VLAN traffic leaks PCR_MATRIX field was set to all 1's when VLAN filtering is enabled, but was not reset when it is disabled, which may cause traffic leaks: ip link add br0 type bridge vlan_filtering 1 ip link add br1 type bridge vlan_filtering 1 ip link set swp0 master br0 ip link set swp1 master br1 ip link set br0 type bridge vlan_filtering 0 ip link set br1 type bridge vlan_filtering 0 # traffic in br0 and br1 will start leaking to each other As port_bridge_{add,del} have set up PCR_MATRIX properly, remove the PCR_MATRIX write from mt7530_port_set_vlan_aware.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78d	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.13
linux	linux_kernel	5.13
linux	linux_kernel	5.13

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/dsa/mt7530.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
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          ],
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          "versions": [
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            },
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.4.124",
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              "status": "unaffected",
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              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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    }
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mt7530: fix VLAN traffic leaks\n\nPCR_MATRIX field was set to all 1\u0027s when VLAN filtering is enabled, but\nwas not reset when it is disabled, which may cause traffic leaks:\n\n\tip link add br0 type bridge vlan_filtering 1\n\tip link add br1 type bridge vlan_filtering 1\n\tip link set swp0 master br0\n\tip link set swp1 master br1\n\tip link set br0 type bridge vlan_filtering 0\n\tip link set br1 type bridge vlan_filtering 0\n\t# traffic in br0 and br1 will start leaking to each other\n\nAs port_bridge_{add,del} have set up PCR_MATRIX properly, remove the\nPCR_MATRIX write from mt7530_port_set_vlan_aware."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: dsa: mt7530: corregir fugas de tr\u00e1fico de VLAN El campo PCR_MATRIX se configur\u00f3 en todos 1 cuando el filtrado de VLAN est\u00e1 habilitado, pero no se restableci\u00f3 cuando est\u00e1 deshabilitado, lo que puede causar fugas de tr\u00e1fico: enlace ip agregar puente tipo br0 vlan_filtering 1 enlace ip agregar puente tipo br1 vlan_filtering 1 conjunto de enlaces ip swp0 master br0 conjunto de enlaces ip swp1 maestro br1 conjunto de enlaces ip br0 puente tipo vlan_filtering 0 conjunto de enlaces ip br1 tipo puente vlan_filtering 0 # tr\u00e1fico en br0 y br1 comenzar\u00e1n a filtrarse entre s\u00ed. Como port_bridge_{add,del} ha configurado PCR_MATRIX correctamente, elimine la escritura PCR_MATRIX de mt7530_port_set_vlan_aware."
    }
  ],
  "id": "CVE-2021-47160",
  "lastModified": "2026-08-04T10:16:49.620",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "version": "2.0.3"
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  "published": "2024-03-25T10:15:08.377",
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}

CVE-2021-47160 (GCVE-0-2021-47160)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2026-08-05 08:46

Title

net: dsa: mt7530: fix VLAN traffic leaks

Summary

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-25 13:55 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6992 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/ae389812733b1b1e8…
https://git.kernel.org/stable/c/4fe4e1f48ba119bdb…
https://git.kernel.org/stable/c/b91117b66fe875723…
https://git.kernel.org/stable/c/82ae35b6c14feae5f…
https://git.kernel.org/stable/c/474a2ddaa19277752…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 83163f7dca5684816d01c8ccf4857aa74801e7b7 , < ae389812733b1b1e8e07fcc238e41db166b5c78d (git) Affected: 83163f7dca5684816d01c8ccf4857aa74801e7b7 , < 4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488 (git) Affected: 83163f7dca5684816d01c8ccf4857aa74801e7b7 , < b91117b66fe875723a4e79ec6263526fffdb44d2 (git) Affected: 83163f7dca5684816d01c8ccf4857aa74801e7b7 , < 82ae35b6c14feae5f216913d5b433e143c756d4e (git) Affected: 83163f7dca5684816d01c8ccf4857aa74801e7b7 , < 474a2ddaa192777522a7499784f1d60691cd831a (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 4.19.193 , ≤ 4.19.* (semver) Unaffected: 5.4.124 , ≤ 5.4.* (semver) Unaffected: 5.10.42 , ≤ 5.10.* (semver) Unaffected: 5.12.9 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47160",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-25T13:55:35.659497Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:13:48.308Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
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          "dateUpdated": "2024-08-04T05:24:39.982Z",
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        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "versions": [
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      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.193",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.124",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.42",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.9",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mt7530: fix VLAN traffic leaks\n\nPCR_MATRIX field was set to all 1\u0027s when VLAN filtering is enabled, but\nwas not reset when it is disabled, which may cause traffic leaks:\n\n\tip link add br0 type bridge vlan_filtering 1\n\tip link add br1 type bridge vlan_filtering 1\n\tip link set swp0 master br0\n\tip link set swp1 master br1\n\tip link set br0 type bridge vlan_filtering 0\n\tip link set br1 type bridge vlan_filtering 0\n\t# traffic in br0 and br1 will start leaking to each other\n\nAs port_bridge_{add,del} have set up PCR_MATRIX properly, remove the\nPCR_MATRIX write from mt7530_port_set_vlan_aware."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug breaks hardware port-matrix isolation on the MT7530 DSA Ethernet switch so frames on one user port are forwarded to other ports that belong to a different bridge; an attacker must be on the same L2 segment (wired LAN or guest Wi\u2011Fi bridged onto a DSA port), which is Adjacent, not remote Internet.\nAC:L - After the common multi-bridge vlan_filtering enable-then-disable sequence leaves PCR_MATRIX as ALL_MEMBERS in PORT_MATRIX_MODE, forwarding between the wrongly linked ports is deterministic\u2014the attacker only needs to send or receive ordinary Ethernet frames with no race or uncontrollable hardware state.\nPR:N - Exploitation is by an unauthenticated adjacent host on a switch port or bridged WLAN; no local account or capability on the device is required to sniff or inject across the broken bridge isolation.\nUI:N - No victim action is required; once the switch is in the vulnerable matrix state, the attacker\u2019s own traffic is forwarded across the isolation boundary automatically.\nS:U - Impact stays within the same kernel/switch forwarding authority (cross-bridge L2 leak on one host); it is not a VM/IOMMU/sandbox escape into a different security authority.\nC:H - With PCR_MATRIX stuck at ALL_MEMBERS, frames from other intended-isolated bridges/VLANs are delivered to the attacker\u2019s port, exposing full confidentiality of traffic on those segments.\nI:H - The same all-members matrix lets the attacker inject arbitrary frames into other bridges\u2019 ports, fully compromising integrity of those isolated network segments.\nA:N - The defect is a pure forwarding/isolation failure with no kernel oops, hang, or resource exhaustion in the fixed path; availability of the host is not directly affected."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:46:25.048Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488"
        },
        {
          "url": "https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e"
        },
        {
          "url": "https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a"
        }
      ],
      "title": "net: dsa: mt7530: fix VLAN traffic leaks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47160",
    "datePublished": "2024-03-25T09:16:14.468Z",
    "dateReserved": "2024-03-25T09:12:14.109Z",
    "dateUpdated": "2026-08-05T08:46:25.048Z",
    "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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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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