Medium
Security advisory
A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-35505
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:20 UTC · Revision 1
Source evidence
A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
osv:CVE-2020-35505
Complete source record
{
"id": "52761eeee5f6d3b99bdbab0813c18d0e2173fcddc3bda86c638d9732a3acfa19",
"url": "https://osv.dev/vulnerability/CVE-2020-35505",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-35505",
"summary": "A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.",
"evidence": "osv:CVE-2020-35505",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-35505",
"aliases": [
"CVE-2020-35505"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/qemu/qemu",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "609d7596524ab204ccd71ef42c9eee4c7c338ea4"
},
{
"introduced": "6d40ce00c1166c317e298ad82ecf10e650c4f87d"
},
{
"last_affected": "d0d3dd401b70168a353450e031727affee828527"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "6.0.0"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:qemu:qemu:6.0.0:rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0.0-rc1"
},
{
"last_affected": "6.0.0-rc1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:qemu:qemu:6.0.0:rc2:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0.0-rc2"
},
{
"last_affected": "6.0.0-rc2"
}
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"source": "CPE_STRING"
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]
}
}
],
"versions": [
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"6.0.0-rc2",
"v6.0.0-rc2",
"v6.0.0-rc1"
],
"database_specific": {
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}
},
{
"ranges": [
{
"repo": "https://gitlab.com/qemu-project/qemu",
"type": "GIT",
"events": [
{
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},
{
"fixed": "609d7596524ab204ccd71ef42c9eee4c7c338ea4"
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{
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{
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}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
"range": [
{
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},
{
"fixed": "6.0.0"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:qemu:qemu:6.0.0:rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0.0-rc1"
},
{
"last_affected": "6.0.0-rc1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:qemu:qemu:6.0.0:rc2:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0.0-rc2"
},
{
"last_affected": "6.0.0-rc2"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"6.0.0-rc1",
"6.0.0-rc2",
"v6.0.0-rc2",
"v6.0.0-rc1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35505.json"
}
}
],
"modified": "2026-10-24T10:30:27.325253432Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html",
"https://security.gentoo.org/glsa/202208-27",
"https://security.netapp.com/advisory/ntap-20210713-0006/",
"https://bugzilla.redhat.com/show_bug.cgi?id=1909769",
"https://www.openwall.com/lists/oss-security/2021/04/16/3"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-35505",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 431810,
"published_at": "2021-05-28T11:15:07.79+00:00"
}