Vulnerability-Lookup

FKIE_CVE-2021-46998

Vulnerability from fkie_nvd - Published: 2024-02-28 09:15 - Updated: 2026-08-04 10:16

Severity

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3	Patch

Impacted products

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

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cisco/enic/enic_main.c"
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              "version": "5.11.22",
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            },
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              "version": "5.12.5",
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            },
            {
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              "version": "5.13",
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  ],
  "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": "2026-08-04T10:16:40.587",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "timestamp": "2024-09-10T16:00:51.946004Z",
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  "published": "2024-02-28T09:15:38.090",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
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  ]
}

CVE-2021-46998 (GCVE-0-2021-46998)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-08-05 08:45

Title

ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

Summary

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 16:00 UTC

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/25a87b1f566b5eb2a…
https://git.kernel.org/stable/c/f7f6f07774091a6dd…
https://git.kernel.org/stable/c/7afdd6aba95c8a526…
https://git.kernel.org/stable/c/6892396ebf04ea2c0…
https://git.kernel.org/stable/c/d90529392aaf498da…
https://git.kernel.org/stable/c/643001b47adc844ae…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 , < 25a87b1f566b5eb2af2857a928f0e2310d900976 (git) Affected: fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 , < f7f6f07774091a6ddd98500b85386c3c6afb30d3 (git) Affected: fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 , < 7afdd6aba95c8a526038e7abe283eeac3e4320f1 (git) Affected: fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 , < 6892396ebf04ea2c021d80e10f4075e014cd7cc3 (git) Affected: fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 , < d90529392aaf498dafa95d212295d64b2cea4e24 (git) Affected: fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3 , < 643001b47adc844ae33510c4bb93c236667008a3 (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (semver) Unaffected: 4.19.191 , ≤ 4.19.* (semver) Unaffected: 5.4.120 , ≤ 5.4.* (semver) Unaffected: 5.10.38 , ≤ 5.10.* (semver) Unaffected: 5.11.22 , ≤ 5.11.* (semver) Unaffected: 5.12.5 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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          "dateUpdated": "2024-08-04T05:24:38.462Z",
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          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.191",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.120",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.38",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.11.22",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.5",
                  "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\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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is in enic ndo_start_xmit (enic_hard_start_xmit \u2192 enic_queue_wq_skb \u2192 skb_tx_timestamp), reached when a local process transmits via ordinary socket send over an enic netdev; remote peers do not enter this TX-prepare path.\nAC:L - Once DMA mapping fails, the free-then-skb_tx_timestamp UAF is deterministic with no race; a local attacker can induce mapping failure by exhausting swiotlb/IOMMU resources, which is within attacker influence.\nPR:L - Any unprivileged local user can send packets out an up enic interface through the generic networking stack; no CAP_NET_ADMIN or other capability is required on the transmit path.\nUI:N - The attacker triggers the TX path and resource exhaustion themselves via their own send syscalls; no victim action is required.\nS:U - This is a standard in-kernel skb heap UAF enabling local privilege escalation within the same kernel security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free of the skb (skb_shinfo/tx_flags access, and skb_tstamp_tx when SKBTX_SW_TSTAMP is set) allows heap spraying and reuse of the freed object, enabling arbitrary kernel memory disclosure primitives.\nI:H - The same skb UAF enables heap corruption and write/control-flow hijack primitives after reclaim, per UAF exploitation guidance.\nA:H - Accessing the freed skb in skb_tx_timestamp reliably causes kernel oops/panic even without a full exploit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:45:27.902Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24"
        },
        {
          "url": "https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3"
        }
      ],
      "title": "ethernet:enic: Fix a use after free bug in enic_hard_start_xmit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46998",
    "datePublished": "2024-02-28T08:13:21.651Z",
    "dateReserved": "2024-02-27T18:42:55.950Z",
    "dateUpdated": "2026-08-05T08:45:27.902Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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

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.
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FKIE_CVE-2021-46998

CVE-2021-46998 (GCVE-0-2021-46998)

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