Vulnerability-Lookup

GHSA-5GVC-4QPH-J93R

Vulnerability from github – Published: 2022-05-24 19:06 – Updated: 2026-08-26 18:30

Details

Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-28691"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-06-29T12:15:00Z",
    "severity": "HIGH"
  },
  "details": "Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.",
  "id": "GHSA-5gvc-4qph-j93r",
  "modified": "2026-08-26T18:30:26Z",
  "published": "2022-05-24T19:06:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28691"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202107-30"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20210805-0002"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-374.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-28691 (GCVE-0-2021-28691)

Vulnerability from cvelistv5 – Published: 2021-06-29 11:30 – Updated: 2024-08-03 21:47

Summary

Severity

No CVSS data available.

CWE

unknown

Assigner

XEN mitre root Scorecard

References

3 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-374.txt	x_refsource_MISC
https://security.gentoo.org/glsa/202107-30	vendor-advisoryx_refsource_GENTOO
https://security.netapp.com/advisory/ntap-2021080…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
Linux	Linux	Unknown: unspecified , < 4.12 (custom) Affected: 5.5.0 , < unspecified (custom) Unaffected: next of 5.12.2 , < unspecified (custom)

Credits

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Michael Brown of iPXE and diagnosed by\nOlivier Benjamin, Michael Kurth and Martin Mazein of AWS.'}]}}}

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            "url": "https://xenbits.xenproject.org/xsa/advisory-374.txt"
          },
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            "name": "GLSA-202107-30",
            "tags": [
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              "x_transferred"
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            "url": "https://security.gentoo.org/glsa/202107-30"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210805-0002/"
          }
        ],
        "title": "CVE Program Container"
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    ],
    "cna": {
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          "versions": [
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              "status": "unaffected",
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            }
          ]
        }
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      "metrics": [
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          "url": "https://security.netapp.com/advisory/ntap-20210805-0002/"
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                            "version_value": "4.12"
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                            "version_value": "5.5.0"
                          },
                          {
                            "version_affected": "!\u003e",
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                          }
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                "vendor_name": "Linux"
              }
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        "configuration": {
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}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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.

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GHSA-5GVC-4QPH-J93R

CVE-2021-28691 (GCVE-0-2021-28691)

Tags

Sightings

Nomenclature

Related by attack behaviour