|Bugzilla:||699773: CVE-2011-1751 qemu: acpi_piix4: missing hotplug check during device removal|
The MITRE CVE dictionary describes this issue as:
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."
This issue only affects Red Hat Enterprise Linux 6. The version of the qemu/kvm as shipped with Red Hat Enterprise Linux 5 is not affected.
CVSS v2 metrics
|Access Vector:||Adjacent Network|
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Red Hat security errata
|Red Hat Enterprise Linux version 6 (qemu-kvm)||RHSA-2011:0534||May 19, 2011|
Red Hat would like to thank Nelson Elhage for reporting this issue.
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For clarification or corrections please contact the Red Hat Security Response Team.