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CVE-2021-3748 (GCVE-0-2021-3748)

Vulnerability from cvelistv5 – Published: 2022-03-23 19:46 – Updated: 2024-08-03 17:09
VLAI
Summary
A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.
Severity
7.5 (High)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a QEMU (virtio-net) Affected: Affects qemu v0.10.0 and above, Fixed In – v6.2.0-rc0 and above.
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Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Mailing List\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202208-27\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20220425-0004/\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://ubuntu.com/security/CVE-2021-3748\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=1998514\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202208-27\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20220425-0004/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://ubuntu.com/security/CVE-2021-3748\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:48:02+00:00",
      "cve": "CVE-2021-3748",
      "id": "CVE-2021-3748",
      "initial_release_date": "2021-08-27T00:00:00+00:00",
      "product_status:fixed": "2813",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "24",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "QEMU: virtio-net: heap use-after-free in virtio_net_receive_rcu",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3748.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T02:26:06Z",
      "cve": "CVE-2021-3748",
      "id": "CVE-2021-3748",
      "initial_release_date": "2023-02-15T03:48:34Z",
      "product_status:known_affected": "389",
      "product_status:known_not_affected": "1",
      "product_status:recommended": "1922",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-3748",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-3748.json",
      "version": "46"
    }
  }
}



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Taxonomy of the tags.





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

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

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.