Vulnerability-Lookup

GHSA-JHG5-Q2MJ-R9VH

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-11-05 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: Fix dereference of null pointer flow

In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then nft_flow_rule_create is not called and flow is NULL. The subsequent error handling execution via label err_destroy_flow_rule will lead to a null pointer dereference on flow when calling nft_flow_rule_destroy. Since the error path to err_destroy_flow_rule has to cater for null and non-null flows, only call nft_flow_rule_destroy if flow is non-null to fix this issue.

Addresses-Coverity: ("Explicity null dereference")

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47312"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:18Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: Fix dereference of null pointer flow\n\nIn the case where chain-\u003eflags \u0026 NFT_CHAIN_HW_OFFLOAD is false then\nnft_flow_rule_create is not called and flow is NULL. The subsequent\nerror handling execution via label err_destroy_flow_rule will lead\nto a null pointer dereference on flow when calling nft_flow_rule_destroy.\nSince the error path to err_destroy_flow_rule has to cater for null\nand non-null flows, only call nft_flow_rule_destroy if flow is non-null\nto fix this issue.\n\nAddresses-Coverity: (\"Explicity null dereference\")",
  "id": "GHSA-jhg5-q2mj-r9vh",
  "modified": "2024-11-05T18:31:59Z",
  "published": "2024-05-21T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47312"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-47312 (GCVE-0-2021-47312)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52

Title

netfilter: nf_tables: Fix dereference of null pointer flow

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix dereference of null pointer flow In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then nft_flow_rule_create is not called and flow is NULL. The subsequent error handling execution via label err_destroy_flow_rule will lead to a null pointer dereference on flow when calling nft_flow_rule_destroy. Since the error path to err_destroy_flow_rule has to cater for null and non-null flows, only call nft_flow_rule_destroy if flow is non-null to fix this issue. Addresses-Coverity: ("Explicity null dereference")

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-29 18:11 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

Linux mitre root Scorecard

References

2 references

URL	Tags
https://git.kernel.org/stable/c/70a5a1950cca02c5c…
https://git.kernel.org/stable/c/4ca041f919f13783b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 09b1f676e2e0bbff67c568672c565c6f31470157 , < 70a5a1950cca02c5cd161bb3846b4d983eed97d3 (git) Affected: 3c5e44622011b9ea21bd425875dcccfc9a158f5f , < 4ca041f919f13783b0b03894783deee00dbca19a (git)
Linux	Linux	Affected: 5.13.2 , < 5.13.5 (semver)

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
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            "other": {
              "content": {
                "id": "CVE-2021-47312",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-29T18:11:18.013824Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
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          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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    "datePublished": "2024-05-21T14:35:29.963Z",
    "dateReserved": "2024-05-21T14:28:16.973Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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GHSA-JHG5-Q2MJ-R9VH

CVE-2021-47312 (GCVE-0-2021-47312)

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