FKIE_CVE-2021-46998

Vulnerability from fkie_nvd - Published: 2024-02-28 09:15 - Updated: 2026-06-17 04:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb). My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "25a87b1f566b5eb2af2857a928f0e2310d900976",
              "status": "affected",
              "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
              "versionType": "git"
            },
            {
              "lessThan": "f7f6f07774091a6ddd98500b85386c3c6afb30d3",
              "status": "affected",
              "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
              "versionType": "git"
            },
            {
              "lessThan": "7afdd6aba95c8a526038e7abe283eeac3e4320f1",
              "status": "affected",
              "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
              "versionType": "git"
            },
            {
              "lessThan": "6892396ebf04ea2c021d80e10f4075e014cd7cc3",
              "status": "affected",
              "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
              "versionType": "git"
            },
            {
              "lessThan": "d90529392aaf498dafa95d212295d64b2cea4e24",
              "status": "affected",
              "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
              "versionType": "git"
            },
            {
              "lessThan": "643001b47adc844ae33510c4bb93c236667008a3",
              "status": "affected",
              "version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.11.*",
              "status": "unaffected",
              "version": "5.11.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F677F1C8-2451-43EC-9555-E283697C189E",
              "versionEndExcluding": "4.19.191",
              "versionStartIncluding": "4.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2BDC71CF-4451-4D53-93E9-61DE7C4E25B0",
              "versionEndExcluding": "5.4.120",
              "versionStartIncluding": "4.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2BB4E5E8-4AAD-475A-A1B9-F287254C7D72",
              "versionEndExcluding": "5.10.38",
              "versionStartIncluding": "5.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83B53E9A-F426-4C03-9A5F-A931FF79827E",
              "versionEndExcluding": "5.11.22",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0274929A-B36C-4F4C-AB22-30A0DD6B995B",
              "versionEndExcluding": "5.12.5",
              "versionStartIncluding": "5.12",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens, the skb will be freed\nby dev_kfree_skb(skb). But the freed skb is still used in\nskb_tx_timestamp(skb).\n\nMy patch makes enic_queue_wq_skb() return error and goto spin_unlock()\nincase of error. The solution is provided by Govind.\nSee https://lkml.org/lkml/2021/4/30/961."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ethernet:enic: corrige un error de use after free en enic_hard_start_xmit. En enic_hard_start_xmit, llama a enic_queue_wq_skb(). Dentro de enic_queue_wq_skb, si ocurre alg\u00fan error, dev_kfree_skb(skb) liberar\u00e1 el skb. Pero el skb liberado todav\u00eda se usa en skb_tx_timestamp(skb). Mi parche hace que enic_queue_wq_skb() devuelva un error y vaya a spin_unlock() en caso de error. La soluci\u00f3n la proporciona Govind. Consulte https://lkml.org/lkml/2021/4/30/961."
    }
  ],
  "id": "CVE-2021-46998",
  "lastModified": "2026-06-17T04:16:07.677",
  "metrics": {
    "cvssMetricV31": [
      {
        "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-2021-46998",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T16:00:51.946004Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-02-28T09:15:38.090",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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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 patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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