CVE-2021-47164 (GCVE-0-2021-47164)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2026-05-11 13:49
VLAI
Title
net/mlx5e: Fix null deref accessing lag dev
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix null deref accessing lag dev It could be the lag dev is null so stop processing the event. In bond_enslave() the active/backup slave being set before setting the upper dev so first event is without an upper dev. After setting the upper dev with bond_master_upper_dev_link() there is a second event and in that event we have an upper dev.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-28 18:24 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7e51891a237f9ea319f53f9beb83afb0077d88e6 , < 2e4b0b95a489259f9d35a3db17023061f8f3d587 (git)
Affected: 7e51891a237f9ea319f53f9beb83afb0077d88e6 , < bdfd3593a8248eea6ecfcbf7b47b56b86515672d (git)
Affected: 7e51891a237f9ea319f53f9beb83afb0077d88e6 , < 83026d83186bc48bb41ee4872f339b83f31dfc55 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.42 , ≤ 5.10.* (semver)
Unaffected: 5.12.9 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-03-28T18:24:43.257372Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-05-23T19:01:19.880Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/mellanox/mlx5/core/en/rep/bond.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "2e4b0b95a489",
                  "status": "affected",
                  "version": "7e51891a237f",
                  "versionType": "git"
                },
                {
                  "lessThan": "bdfd3593a824",
                  "status": "affected",
                  "version": "7e51891a237f",
                  "versionType": "git"
                },
                {
                  "lessThan": "83026d83186b",
                  "status": "affected",
                  "version": "7e51891a237f",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/mellanox/mlx5/core/en/rep/bond.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.8"
                },
                {
                  "lessThan": "5.8",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.42",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.9",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix null deref accessing lag dev\n\nIt could be the lag dev is null so stop processing the event.\nIn bond_enslave() the active/backup slave being set before setting the\nupper dev so first event is without an upper dev.\nAfter setting the upper dev with bond_master_upper_dev_link() there is\na second event and in that event we have an upper dev."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2024-05-29T05:03:09.305Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2e4b0b95a489259f9d35a3db17023061f8f3d587"
            },
            {
              "url": "https://git.kernel.org/stable/c/bdfd3593a8248eea6ecfcbf7b47b56b86515672d"
            },
            {
              "url": "https://git.kernel.org/stable/c/83026d83186bc48bb41ee4872f339b83f31dfc55"
            }
          ],
          "title": "net/mlx5e: Fix null deref accessing lag dev",
          "x_generator": {
            "engine": "bippy-a5840b7849dd"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47164",
        "datePublished": "2024-03-25T09:16:17.592Z",
        "dateReserved": "2024-03-25T09:12:14.109Z",
        "dateUpdated": "2024-06-04T17:14:45.571Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



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.