CVE-2016-9921: Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zer...

Security readout for executives and security teams

This flaw lets a privileged user inside a virtual machine crash that VM's QEMU process on the host when Cirrus VGA emulation is enabled. The described impact is denial of service, not data theft or host code execution. Exposure depends on QEMU configuration and vendor package versions. Likely exposure is limited to QEMU environments built with Cirrus CLGD 54xx VGA support and VMs using that emulated graphics device. Multi-tenant virtualization or untrusted guest administrators increase business relevance. The source bundle does not enumerate exact affected products or versions. Treat as a targeted availability risk for virtualization platforms. It warrants patching during normal security maintenance, with faster action where untrusted or tenant-controlled guest administrators can affect production VM availability. Mitigation focus: Apply QEMU security updates from the relevant Linux distribution advisory.; Check vendor guidance for exact fixed package versions.; Avoid Cirrus VGA emulation for untrusted guests where supported alternatives exist..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.