High
Security advisory
A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3929
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:49 UTC · Revision 1
Source evidence
A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.
osv:CVE-2021-3929
Complete source record
{
"id": "ae51b63daa8fd85bb243f0ac34c44584b2902fff07d145a79d3574f22bcdb007",
"url": "https://osv.dev/vulnerability/CVE-2021-3929",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3929",
"summary": "A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.",
"evidence": "osv:CVE-2021-3929",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3929",
"aliases": [
"CVE-2021-3929"
],
"metrics": [
{
"type": "CVSS_V3",
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"modified": "2026-10-24T10:50:25.228151222Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHNN7QJCEQH7AQG5AQP2GEFAQE6K635I/",
"https://access.redhat.com/security/cve/CVE-2021-3929",
"https://security.netapp.com/advisory/ntap-20250228-0010/",
"https://gitlab.com/qemu-project/qemu/-/issues/556",
"https://bugzilla.redhat.com/show_bug.cgi?id=2020298",
"https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385",
"https://gitlab.com/qemu-project/qemu/-/issues/782"
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},
"related_cves": [
{
"value": "CVE-2021-3929",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442142,
"published_at": "2022-08-25T20:15:09.417+00:00"
}