High
Security advisory
An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command from the guest. It could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service condition, or potential code execution with the privileges of the QEMU process.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3546
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:51 UTC · Revision 1
Source evidence
An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command from the guest. It could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service condition, or potential code execution with the privileges of the QEMU process.
osv:CVE-2021-3546
Complete source record
{
"id": "07d33bbc34d687496a1af0983a7357433498dcc62e92abbd872c644a551b60f1",
"url": "https://osv.dev/vulnerability/CVE-2021-3546",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3546",
"summary": "An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command from the guest. It could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service condition, or potential code execution with the privileges of the QEMU process.",
"evidence": "osv:CVE-2021-3546",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3546",
"aliases": [
"CVE-2021-3546"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"
}
],
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{
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],
"modified": "2026-10-24T10:30:22.829301060Z",
"provider": "osv",
"references": [
"https://security.gentoo.org/glsa/202208-27",
"https://security.netapp.com/advisory/ntap-20210720-0008/",
"https://www.debian.org/security/2021/dsa-4980",
"https://bugzilla.redhat.com/show_bug.cgi?id=1958978"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
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],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
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{
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},
{
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}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-3546",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430775,
"published_at": "2021-06-02T14:15:11.12+00:00"
}