github - ghsa-2948-3mj2-4gw2

ghsa-2948-3mj2-4gw2

Vulnerability from github

Published

2024-03-01 00:30

Modified

2024-03-01 00:30

Details

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

KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs

Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting VMSAs for SEV, which effectively switches to use online_vcpus instead of created_vcpus. This fixes a possible null-pointer dereference as created_vcpus does not guarantee a vCPU exists, since it is updated at the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the bulk of vCPU creation to run in parallel, while still correctly restricting the max number of max vCPUs.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47062"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-29T23:15:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs\n\nUse the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting\nVMSAs for SEV, which effectively switches to use online_vcpus instead of\ncreated_vcpus.  This fixes a possible null-pointer dereference as\ncreated_vcpus does not guarantee a vCPU exists, since it is updated at\nthe very beginning of KVM_CREATE_VCPU.  created_vcpus exists to allow the\nbulk of vCPU creation to run in parallel, while still correctly\nrestricting the max number of max vCPUs.",
  "id": "GHSA-2948-3mj2-4gw2",
  "modified": "2024-03-01T00:30:28Z",
  "published": "2024-03-01T00:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47062"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40"
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2"
    },
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      "url": "https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1"
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  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-47062

Vulnerability from cvelistv5

Published

2024-02-29 22:37

Modified

2024-11-04 11:58

Severity ?

Summary

KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs

References

▼	URL	Tags
	https://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2
	https://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40
	https://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1

Impacted products

▼	Vendor	Product
	Linux	Linux
	Linux	Linux

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2024-03-05T22:14:24.335971Z",
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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