Security readout for executives and security teams
CVE-2021-3546 is a QEMU vhost-user-gpu memory corruption flaw. A privileged user inside a guest VM could crash the QEMU process on the host, causing denial of service, with potential code execution as the QEMU process. It matters most where untrusted or multi-tenant guests can influence VM graphics devices. Exposure is likely limited to virtualization hosts running affected QEMU versions with vhost-user-gpu available to guests. Risk is higher in hosted, lab, desktop virtualization, or multi-tenant environments where guest administrators are not fully trusted. Treat this as a high-priority virtualization platform issue where affected QEMU hosts run untrusted guests. The primary confirmed business risk is VM service disruption; potential host process code execution raises the urgency, but exploitation evidence is incomplete in the provided sources. Mitigation focus: Upgrade QEMU using the relevant vendor or distribution advisory.; Prioritize hosts running QEMU 6.0 or earlier with vhost-user-gpu enabled.; Review Debian, Gentoo, Red Hat, and appliance vendor guidance for fixed packages..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-787: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-3546 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.redhat.com/show_bug.cgi?id=1958978CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210720-0008/CVE reference · x_refsource_CONFIRM
- DSA-4980CVE reference · vendor-advisory, x_refsource_DEBIAN
- GLSA-202208-27CVE reference · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.