CVE-2015-4106: QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices,...

Security readout for executives and security teams

This is a virtualization isolation flaw in QEMU involving PCI pass-through. A guest VM with local access may be able to affect the host, including privilege gain, host crash, or information exposure. It matters most where untrusted or multi-tenant x86 HVM guests receive PCI devices directly. Exposure is most likely on virtualization hosts using QEMU with x86 HVM guests and PCI pass-through. Standard VMs without PCI pass-through are less clearly implicated by the provided sources. Treat as high priority for legacy or multi-tenant virtualization environments using PCI pass-through. The business risk is VM escape-style impact against the host, but evidence provided does not support active exploitation claims. Mitigation focus: Apply relevant vendor updates from Ubuntu, Debian, SUSE, Fedora, Gentoo, Citrix, or Xen guidance.; Inventory hosts using PCI pass-through with QEMU-backed x86 HVM guests.; Restrict PCI pass-through to trusted guests until vendor guidance is confirmed..

Prepared

Jun 13, 2026, 22:39 UTC (UTC+00:00)

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