Vulnerability-Lookup

OESA-2021-1371 (CVE-2021-3748)

Vulnerability from osv_openeuler – Published: 2021-09-30 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

qemu security update

Details

QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.

Security Fix(es):

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. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.(CVE-2021-3748)

Severity

7.5 (High)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3748	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "qemu-debugsource-4.1.0-57.oe1.aarch64.rpm",
          "qemu-block-rbd-4.1.0-57.oe1.aarch64.rpm",
          "qemu-block-iscsi-4.1.0-57.oe1.aarch64.rpm",
          "qemu-block-ssh-4.1.0-57.oe1.aarch64.rpm",
          "qemu-4.1.0-57.oe1.aarch64.rpm",
          "qemu-guest-agent-4.1.0-57.oe1.aarch64.rpm",
          "qemu-block-curl-4.1.0-57.oe1.aarch64.rpm",
          "qemu-debuginfo-4.1.0-57.oe1.aarch64.rpm",
          "qemu-img-4.1.0-57.oe1.aarch64.rpm"
        ],
        "noarch": [
          "qemu-help-4.1.0-57.oe1.noarch.rpm"
        ],
        "src": [
          "qemu-4.1.0-57.oe1.src.rpm"
        ],
        "x86_64": [
          "qemu-guest-agent-4.1.0-57.oe1.x86_64.rpm",
          "qemu-debugsource-4.1.0-57.oe1.x86_64.rpm",
          "qemu-seabios-4.1.0-57.oe1.x86_64.rpm",
          "qemu-block-rbd-4.1.0-57.oe1.x86_64.rpm",
          "qemu-img-4.1.0-57.oe1.x86_64.rpm",
          "qemu-block-ssh-4.1.0-57.oe1.x86_64.rpm",
          "qemu-block-curl-4.1.0-57.oe1.x86_64.rpm",
          "qemu-block-iscsi-4.1.0-57.oe1.x86_64.rpm",
          "qemu-4.1.0-57.oe1.x86_64.rpm",
          "qemu-debuginfo-4.1.0-57.oe1.x86_64.rpm"
        ]
      },
      "package": {
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        "name": "qemu",
        "purl": "pkg:rpm/openEuler/qemu\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.0-57.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "qemu-debuginfo-4.1.0-58.oe1.aarch64.rpm",
          "qemu-block-ssh-4.1.0-58.oe1.aarch64.rpm",
          "qemu-block-curl-4.1.0-58.oe1.aarch64.rpm",
          "qemu-4.1.0-58.oe1.aarch64.rpm",
          "qemu-block-rbd-4.1.0-58.oe1.aarch64.rpm",
          "qemu-img-4.1.0-58.oe1.aarch64.rpm",
          "qemu-guest-agent-4.1.0-58.oe1.aarch64.rpm",
          "qemu-block-iscsi-4.1.0-58.oe1.aarch64.rpm",
          "qemu-debugsource-4.1.0-58.oe1.aarch64.rpm"
        ],
        "noarch": [
          "qemu-help-4.1.0-58.oe1.noarch.rpm"
        ],
        "src": [
          "qemu-4.1.0-58.oe1.src.rpm"
        ],
        "x86_64": [
          "qemu-debugsource-4.1.0-58.oe1.x86_64.rpm",
          "qemu-debuginfo-4.1.0-58.oe1.x86_64.rpm",
          "qemu-4.1.0-58.oe1.x86_64.rpm",
          "qemu-block-iscsi-4.1.0-58.oe1.x86_64.rpm",
          "qemu-img-4.1.0-58.oe1.x86_64.rpm",
          "qemu-block-ssh-4.1.0-58.oe1.x86_64.rpm",
          "qemu-block-curl-4.1.0-58.oe1.x86_64.rpm",
          "qemu-guest-agent-4.1.0-58.oe1.x86_64.rpm",
          "qemu-seabios-4.1.0-58.oe1.x86_64.rpm",
          "qemu-block-rbd-4.1.0-58.oe1.x86_64.rpm"
        ]
      },
      "package": {
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        "purl": "pkg:rpm/openEuler/qemu\u0026distro=openEuler-20.03-LTS-SP2"
      },
      "ranges": [
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          "events": [
            {
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            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed.\r\n\r\nSecurity Fix(es):\r\n\r\nA use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor\u0026apos;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. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.(CVE-2021-3748)",
  "id": "OESA-2021-1371",
  "modified": "2026-08-06T11:04:38Z",
  "published": "2021-09-30T11:04:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1371"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3748"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "qemu security update",
  "upstream": [
    "CVE-2021-3748"
  ]
}

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

Vulnerability from cvelistv5 – Published: 2022-03-23 19:46 – Updated: 2024-08-03 17:09

Summary

Severity

No CVSS data available.

CWE

CWE-416 - - Use After Free

Assigner

redhat redhat root

References

8 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1998514	x_refsource_MISC
https://ubuntu.com/security/CVE-2021-3748	x_refsource_MISC
https://github.com/qemu/qemu/commit/bedd7e93d0196…	x_refsource_MISC
https://lists.nongnu.org/archive/html/qemu-devel/…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-2022042…	x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-27	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	QEMU (virtio-net)	Affected: Affects qemu v0.10.0 and above, Fixed In – v6.2.0-rc0 and above.

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

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.

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.