CVE-2021-47352 (GCVE-0-2021-47352)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
Title
virtio-net: Add validation for used length
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio-net: Add validation for used length This adds validation for used length (might come from an untrusted device) to avoid data corruption or loss.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:38 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f6b10209b90d48a84f886ab2b317b5d2cbfe3143 , < c1b40d1959517ff2ea473d40eeab4691d6d62462 (git)
Affected: f6b10209b90d48a84f886ab2b317b5d2cbfe3143 , < c92298d228f61589dd21657af2bea95fc866b813 (git)
Affected: f6b10209b90d48a84f886ab2b317b5d2cbfe3143 , < 3133e01514c3c498f2b01ff210ee6134b70c663c (git)
Affected: f6b10209b90d48a84f886ab2b317b5d2cbfe3143 , < ba710baa1cc1b17a0483f7befe03e696efd17292 (git)
Affected: f6b10209b90d48a84f886ab2b317b5d2cbfe3143 , < ad993a95c508417acdeb15244109e009e50d8758 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.4.293 , ≤ 5.4.* (semver)
Unaffected: 5.10.51 , ≤ 5.10.* (semver)
Unaffected: 5.12.18 , ≤ 5.12.* (semver)
Unaffected: 5.13.3 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:08.505Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47352",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:38:39.694535Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:33:48.464Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c1b40d1959517ff2ea473d40eeab4691d6d62462",
              "status": "affected",
              "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
              "versionType": "git"
            },
            {
              "lessThan": "c92298d228f61589dd21657af2bea95fc866b813",
              "status": "affected",
              "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
              "versionType": "git"
            },
            {
              "lessThan": "3133e01514c3c498f2b01ff210ee6134b70c663c",
              "status": "affected",
              "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
              "versionType": "git"
            },
            {
              "lessThan": "ba710baa1cc1b17a0483f7befe03e696efd17292",
              "status": "affected",
              "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
              "versionType": "git"
            },
            {
              "lessThan": "ad993a95c508417acdeb15244109e009e50d8758",
              "status": "affected",
              "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.13.*",
              "status": "unaffected",
              "version": "5.13.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.293",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.51",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.18",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13.3",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Add validation for used length\n\nThis adds validation for used length (might come\nfrom an untrusted device) to avoid data corruption\nor loss."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The used length is taken from the virtio used ring written by the device backend (hypervisor/vhost/VDUSE), not from packet payload, so a remote network peer cannot forge it; exploitation requires a locally attached malicious virtio-net device.\nAC:L - The attacker fully controls the used-ring length field and can reliably supply an oversized value on every completed RX buffer with no race or other conditions outside their control.\nPR:N - No privileges on the victim guest are required; a malicious virtio backend can kick the RX virtqueue and the NAPI path in receive_small/receive_mergeable processes the forged length automatically.\nUI:N - Exploitation occurs entirely in the automatic softirq/NAPI receive path when the device completes buffers; no user action is needed.\nS:U - Impact is confined to the guest kernel that runs the virtio-net driver; this is host/device-to-guest corruption within that OS authority, not a guest-to-host or cross-VM escape.\nC:H - An oversized used length can overlap skb_shared_info or drive XDP with a past-the-end data_end, yielding out-of-bounds reads of adjacent kernel memory; memory-corruption bugs of this class are scored C:H.\nI:H - The same oversized length enables skb_shared_info / buffer corruption and XDP out-of-bounds writes before the post-XDP mergeable check, which is exploitable for integrity compromise and control-flow hijacking as the fix notes (data corruption).\nA:H - Lengths beyond skb tailroom hit skb_over_panic, and corrupted RX/sk_buff state can oops or panic the guest kernel, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:47:24.845Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c1b40d1959517ff2ea473d40eeab4691d6d62462"
        },
        {
          "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
        },
        {
          "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
        }
      ],
      "title": "virtio-net: Add validation for used length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47352",
    "datePublished": "2024-05-21T14:35:56.473Z",
    "dateReserved": "2024-05-21T14:28:16.985Z",
    "dateUpdated": "2026-08-05T08:47:24.845Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-47352",
      "date": "2026-10-29",
      "epss": "0.00265",
      "percentile": "0.18433"
    },
    "fkie_nvd": {
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Add validation for used length\n\nThis adds validation for used length (might come\nfrom an untrusted device) to avoid data corruption\nor loss."
        },
        {
          "lang": "es",
          "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: virtio-net: Agregar validaci\u00f3n para la longitud utilizada. Esto agrega validaci\u00f3n para la longitud utilizada (puede provenir de un dispositivo que no es de confianza) para evitar la corrupci\u00f3n o p\u00e9rdida de datos."
        }
      ],
      "id": "CVE-2021-47352",
      "lastModified": "2024-11-21T06:35:56.973",
      "published": "2024-05-21T15:15:21.620",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/virtio_net.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "c1b40d1959517ff2ea473d40eeab4691d6d62462",
                    "status": "affected",
                    "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c92298d228f61589dd21657af2bea95fc866b813",
                    "status": "affected",
                    "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "3133e01514c3c498f2b01ff210ee6134b70c663c",
                    "status": "affected",
                    "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "ba710baa1cc1b17a0483f7befe03e696efd17292",
                    "status": "affected",
                    "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "ad993a95c508417acdeb15244109e009e50d8758",
                    "status": "affected",
                    "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/virtio_net.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "4.11"
                  },
                  {
                    "lessThan": "4.11",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.293",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.51",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.12.*",
                    "status": "unaffected",
                    "version": "5.12.18",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.13.*",
                    "status": "unaffected",
                    "version": "5.13.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "5.14",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "389EB980-4648-446E-A0DC-5FB0265E0F02",
                    "versionEndExcluding": "5.4.293",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "93289127-DFB3-4515-89DD-50521FF8B7FF",
                    "versionEndExcluding": "5.10.51",
                    "versionStartIncluding": "5.5",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "79D13C82-E06F-4A70-A3D1-C09494FBC94D",
                    "versionEndExcluding": "5.12.18",
                    "versionStartIncluding": "5.11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "853187F6-707A-487B-95C0-621B5211B43C",
                    "versionEndExcluding": "5.13.3",
                    "versionStartIncluding": "5.13",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Add validation for used length\n\nThis adds validation for used length (might come\nfrom an untrusted device) to avoid data corruption\nor loss."
          },
          {
            "lang": "es",
            "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: virtio-net: Agregar validaci\u00f3n para la longitud utilizada. Esto agrega validaci\u00f3n para la longitud utilizada (puede provenir de un dispositivo que no es de confianza) para evitar la corrupci\u00f3n o p\u00e9rdida de datos."
          }
        ],
        "id": "CVE-2021-47352",
        "lastModified": "2026-08-04T10:16:59.447",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2021-47352",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:38:39.694535Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-05-21T15:15:21.620",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c1b40d1959517ff2ea473d40eeab4691d6d62462"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-29T08:02:23+00:00",
      "cve": "CVE-2021-47352",
      "id": "CVE-2021-47352",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "416",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "107",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: virtio-net: Add validation for used length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47352.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-28T01:42:10Z",
      "cve": "CVE-2021-47352",
      "id": "CVE-2021-47352",
      "initial_release_date": "2024-05-23T15:56:03Z",
      "product_status:known_affected": "427",
      "product_status:known_not_affected": "167",
      "product_status:recommended": "90",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47352",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2024/cve-2021-47352.json",
      "version": "62"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:08.505Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-47352",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:38:39.694535Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:18.851Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/virtio_net.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "c1b40d1959517ff2ea473d40eeab4691d6d62462",
                  "status": "affected",
                  "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                  "versionType": "git"
                },
                {
                  "lessThan": "c92298d228f61589dd21657af2bea95fc866b813",
                  "status": "affected",
                  "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                  "versionType": "git"
                },
                {
                  "lessThan": "3133e01514c3c498f2b01ff210ee6134b70c663c",
                  "status": "affected",
                  "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                  "versionType": "git"
                },
                {
                  "lessThan": "ba710baa1cc1b17a0483f7befe03e696efd17292",
                  "status": "affected",
                  "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                  "versionType": "git"
                },
                {
                  "lessThan": "ad993a95c508417acdeb15244109e009e50d8758",
                  "status": "affected",
                  "version": "f6b10209b90d48a84f886ab2b317b5d2cbfe3143",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/virtio_net.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.11"
                },
                {
                  "lessThan": "4.11",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.293",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.51",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.18",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.13.*",
                  "status": "unaffected",
                  "version": "5.13.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.14",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.293",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.51",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.18",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13.3",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Add validation for used length\n\nThis adds validation for used length (might come\nfrom an untrusted device) to avoid data corruption\nor loss."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The used length is taken from the virtio used ring written by the device backend (hypervisor/vhost/VDUSE), not from packet payload, so a remote network peer cannot forge it; exploitation requires a locally attached malicious virtio-net device.\nAC:L - The attacker fully controls the used-ring length field and can reliably supply an oversized value on every completed RX buffer with no race or other conditions outside their control.\nPR:N - No privileges on the victim guest are required; a malicious virtio backend can kick the RX virtqueue and the NAPI path in receive_small/receive_mergeable processes the forged length automatically.\nUI:N - Exploitation occurs entirely in the automatic softirq/NAPI receive path when the device completes buffers; no user action is needed.\nS:U - Impact is confined to the guest kernel that runs the virtio-net driver; this is host/device-to-guest corruption within that OS authority, not a guest-to-host or cross-VM escape.\nC:H - An oversized used length can overlap skb_shared_info or drive XDP with a past-the-end data_end, yielding out-of-bounds reads of adjacent kernel memory; memory-corruption bugs of this class are scored C:H.\nI:H - The same oversized length enables skb_shared_info / buffer corruption and XDP out-of-bounds writes before the post-XDP mergeable check, which is exploitable for integrity compromise and control-flow hijacking as the fix notes (data corruption).\nA:H - Lengths beyond skb tailroom hit skb_over_panic, and corrupted RX/sk_buff state can oops or panic the guest kernel, so availability impact is High."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:47:24.845Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/c1b40d1959517ff2ea473d40eeab4691d6d62462"
            },
            {
              "url": "https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813"
            },
            {
              "url": "https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c"
            },
            {
              "url": "https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292"
            },
            {
              "url": "https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758"
            }
          ],
          "title": "virtio-net: Add validation for used length",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47352",
        "datePublished": "2024-05-21T14:35:56.473Z",
        "dateReserved": "2024-05-21T14:28:16.985Z",
        "dateUpdated": "2026-08-05T08:47:24.845Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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

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

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

Loading timeline…


    Loading…

    Loading…

    Loading…

    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.