CVE-2011-1751: Qemu

High severity, CVSS 7.4. EPSS: 0.8% chance of exploitation in the next 30 days.

The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to "active qemu timers."

Affected products

• Qemu Qemu: version 0.1.0 only; version 0.1.1 only; version 0.1.2 only; version 0.1.3 only; version 0.1.4 only; version 0.1.5 only; …

Published 2012-06-21. Last modified 2026-06-16.