CVE-2021-47070 (GCVE-0-2021-47070)

Vulnerability from cvelistv5 – Published: 2024-03-01 21:15 – Updated: 2026-05-11 13:47
VLAI
Title
uio_hv_generic: Fix another memory leak in error handling paths
Summary
In the Linux kernel, the following vulnerability has been resolved: uio_hv_generic: Fix another memory leak in error handling paths Memory allocated by 'vmbus_alloc_ring()' at the beginning of the probe function is never freed in the error handling path. Add the missing 'vmbus_free_ring()' call. Note that it is already freed in the .remove function.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-05 19:35 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cdfa835c6e5e87d145f9f632b58843de97509f2b , < 261bbd90cc53d2835343f056770156cf1e82cf03 (git)
Affected: cdfa835c6e5e87d145f9f632b58843de97509f2b , < 5f59240cf25b2f7a0fdffc2701482a70310fec07 (git)
Affected: cdfa835c6e5e87d145f9f632b58843de97509f2b , < 0b0226be3a52dadd965644bc52a807961c2c26df (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.12.7 , ≤ 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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                "other": {
                  "content": {
                    "id": "CVE-2021-47070",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-03-05T19:35:32.485237Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "description": "CWE-noinfo Not enough information",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-05-23T19:01:15.706Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/uio/uio_hv_generic.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "261bbd90cc53d2835343f056770156cf1e82cf03",
                  "status": "affected",
                  "version": "cdfa835c6e5e87d145f9f632b58843de97509f2b",
                  "versionType": "git"
                },
                {
                  "lessThan": "5f59240cf25b2f7a0fdffc2701482a70310fec07",
                  "status": "affected",
                  "version": "cdfa835c6e5e87d145f9f632b58843de97509f2b",
                  "versionType": "git"
                },
                {
                  "lessThan": "0b0226be3a52dadd965644bc52a807961c2c26df",
                  "status": "affected",
                  "version": "cdfa835c6e5e87d145f9f632b58843de97509f2b",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/uio/uio_hv_generic.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.20"
                },
                {
                  "lessThan": "4.20",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.241",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.7",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.241",
                      "versionStartIncluding": "4.20",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.7",
                      "versionStartIncluding": "4.20",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13",
                      "versionStartIncluding": "4.20",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuio_hv_generic: Fix another memory leak in error handling paths\n\nMemory allocated by \u0027vmbus_alloc_ring()\u0027 at the beginning of the probe\nfunction is never freed in the error handling path.\n\nAdd the missing \u0027vmbus_free_ring()\u0027 call.\n\nNote that it is already freed in the .remove function."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-08-28T14:42:26.907Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/261bbd90cc53d2835343f056770156cf1e82cf03"
            },
            {
              "url": "https://git.kernel.org/stable/c/5f59240cf25b2f7a0fdffc2701482a70310fec07"
            },
            {
              "url": "https://git.kernel.org/stable/c/0b0226be3a52dadd965644bc52a807961c2c26df"
            }
          ],
          "title": "uio_hv_generic: Fix another memory leak in error handling paths",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47070",
        "datePublished": "2024-03-01T21:15:09.387Z",
        "dateReserved": "2024-02-29T22:33:44.296Z",
        "dateUpdated": "2025-11-03T17:30:51.887Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.
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  • 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.