CVE-2021-3748

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Source
https://cve.org/CVERecord?id=CVE-2021-3748
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3748.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-3748
Downstream
Related
Published
2022-03-23T20:15:09.893Z
Modified
2026-07-08T06:00:40.454228852Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "18.04"
                },
                {
                    "last_affected": "18.04"
                },
                {
                    "introduced": "20.04"
                },
                {
                    "last_affected": "20.04"
                },
                {
                    "introduced": "21.10"
                },
                {
                    "last_affected": "21.10"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "canonical:ubuntu_linux",
            "cpes": [
                "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*"
            ]
        },
        {
            "extracted_events": [
                {
                    "introduced": "9.0"
                },
                {
                    "last_affected": "9.0"
                },
                {
                    "introduced": "10.0"
                },
                {
                    "last_affected": "10.0"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "debian:debian_linux",
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ]
        },
        {
            "extracted_events": [
                {
                    "introduced": "34"
                },
                {
                    "last_affected": "34"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "fedoraproject:fedora",
            "cpes": [
                "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ]
        },
        {
            "extracted_events": [
                {
                    "introduced": "8.0"
                },
                {
                    "last_affected": "8.0"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "redhat:enterprise_linux",
            "cpes": [
                "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*"
            ]
        },
        {
            "extracted_events": [
                {
                    "introduced": "8.4"
                },
                {
                    "last_affected": "8.4"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "redhat:enterprise_linux_advanced_virtualization_eus",
            "cpes": [
                "cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:*:*:*:*:*:*:*"
            ]
        }
    ]
}
References

Affected packages

Git / github.com/qemu/qemu

Affected ranges

Type
GIT
Repo
https://github.com/qemu/qemu
Events
Introduced
25c4fde17775821182a76fb8ea2ba2223c5729b9
Fixed
44f28df24767cf9dca1ddc9b23157737c4cbb645
Fixed
bedd7e93d01961fcb16a97ae45d93acf357e11f6
Database specific 
{
    "cpe": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0.10.0"
        },
        {
            "fixed": "6.2.0"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3748.json"

Git / gitlab.com/qemu-project/qemu

Affected ranges

Type
GIT
Repo
https://gitlab.com/qemu-project/qemu
Events
Introduced
25c4fde17775821182a76fb8ea2ba2223c5729b9
Fixed
44f28df24767cf9dca1ddc9b23157737c4cbb645
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0.10.0"
        },
        {
            "fixed": "6.2.0"
        }
    ],
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3748.json"