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Date: June 21, 2012
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."
Weakness Type (CWE)
|Attack Vector (AV):||ADJACENT_NETWORK|
|Attack Complexity (AC):||HIGH|
|Privileges Required (PR):||LOW|
|User Interaction (UI):||NONE|
|Access Vector (AV):||ADJACENT|
|Access Complexity (AC):||MEDIUM|