Medium
Security advisory
An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3930
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:21 UTC · Revision 1
Source evidence
An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
osv:CVE-2021-3930
Complete source record
{
"id": "4f0f219dfb0d35da7be4db8457f989ed9a644ba954a14664d547961782dabab9",
"url": "https://osv.dev/vulnerability/CVE-2021-3930",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3930",
"summary": "An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.",
"evidence": "osv:CVE-2021-3930",
"products": [],
"severity": "medium",
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"aliases": [
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"modified": "2026-10-24T10:30:27.469467029Z",
"provider": "osv",
"references": [
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"https://security.gentoo.org/glsa/202208-27",
"https://security.netapp.com/advisory/ntap-20220225-0007/",
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},
"source_id": "core-osv",
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"published_at": "2022-02-18T18:15:09.683+00:00"
}